Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Roll Forward (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Roll Forward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs         $ 40   $ 6 $ 9 $ (2)
Assets Level 3 Roll Forward:                  
Transfers into Level 3     $ 0            
Transfers out of Level 3 (1)     (75) $ (24)          
Total gains/losses for the period:                  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings     109 31          
Included in OCI $ (20)   2            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)     0 0          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases     0 0          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements     0 0          
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)     34 (6)          
MSRs                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3     0 0          
Assets Level 3 Roll Forward:                  
Opening balance 165 $ 10 7 10          
Transfers out of Level 3 (1) 0 0              
Total gains/losses for the period:                  
Included in earnings 7 (1) (40) (1)          
Included in OCI 0 0 0 0          
Purchases/originations 0 0 0 0          
Repayments 0 0 0 0          
Settlements 0 0 0 0          
Closing balance 165 10 7 10 172 $ 205 7 9 10
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 7 (1) (40) (1)          
Derivative instruments                  
Assets Level 3 Roll Forward:                  
Opening balance 39 5              
Transfers out of Level 3 (1) (55) (15)              
Total gains/losses for the period:                  
Included in earnings (56) (19)              
Included in OCI 0 0              
Purchases/originations 0 0              
Repayments 0 0 0 0          
Settlements 0 0              
Closing balance 39 5     40     9  
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0 4              
Municipal securities                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3     0            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3     0 0          
Assets Level 3 Roll Forward:                  
Opening balance 2,937 3,237 2,999 3,165          
Transfers out of Level 3 (1) 0 0              
Total gains/losses for the period:                  
Included in earnings 0 (1) (1) 0          
Included in OCI 69 3 1 46          
Purchases/originations 264 28 338 108          
Repayments 0 0 0 0          
Settlements (168) (65) (235) (117)          
Closing balance 2,937 3,237 2,999 3,165 3,102   2,999 3,202 3,165
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0 0 0 0          
Mortgage-backed Securities, Issued by Private Enterprises [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0                
Assets Level 3 Roll Forward:                  
Opening balance 2   2            
Transfers out of Level 3 (1) 0                
Total gains/losses for the period:                  
Included in earnings 0                
Included in OCI 0                
Purchases/originations 3                
Repayments 0                
Settlements 0                
Closing balance 2   2   5   2    
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0                
Asset-backed Securities [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3     0            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3     0            
Assets Level 3 Roll Forward:                  
Opening balance 69   48            
Transfers out of Level 3 (1) 0                
Total gains/losses for the period:                  
Included in earnings 0   0            
Included in OCI 0   0            
Purchases/originations 0   28            
Repayments 0   0            
Settlements (13)   (20)            
Closing balance 69   48   56   48    
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0   0            
Automobile                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3     0            
Real Estate Loan [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3     0 0          
Assets Level 3 Roll Forward:                  
Opening balance 26 29 26 30          
Transfers out of Level 3 (1) 0 0              
Total gains/losses for the period:                  
Included in earnings 0 0 0 0          
Included in OCI 0 0 0 0          
Purchases/originations 0 0 0 0          
Repayments (1) (1) (1) (2)          
Settlements 0 0 0 0          
Closing balance 26 29 26 30 25   26 $ 28 $ 30
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ 0 $ 0 $ 0 $ 0          
Fair Value, Recurring [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Available-for-sale securities         13,297   14,149    
Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Available-for-sale securities         788   976    
Fair Value, Recurring [Member] | Residential Mortgage Backed Securities [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Available-for-sale securities         3,838   4,222    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Available-for-sale securities         10,126   11,090    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Available-for-sale securities         788   976    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Residential Mortgage Backed Securities [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Available-for-sale securities         $ 3,838   $ 4,222