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 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
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 $ 8 $ 1 $ 8 $ 1 $ 2 $ 1
Assets Level 3 Roll Forward:            
Transfers out of Level 3 (1)     (44) (26)    
Total gains/losses for the period:            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings     50 25    
Included in OCI 23   68      
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, Sales     0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements     0 (3)    
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)     6 1    
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 9 11 10 11 11  
Transfers out of Level 3 (1) 0 0        
Total gains/losses for the period:            
Included in earnings (1) 0 (2) 0    
Included in OCI 0 0 0 0    
Purchases/originations 0 0 0 0    
Sales 0 0 0 0    
Repayments 0 0 0 0    
Settlements 0 0 0 0    
Closing balance 8 11 8 11 10  
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date (1) 0 (2) 0    
Derivative instruments            
Assets Level 3 Roll Forward:            
Opening balance 9 1        
Transfers out of Level 3 (1) (20) (12)        
Total gains/losses for the period:            
Included in earnings (19) (9)        
Included in OCI 0 0        
Purchases/originations 0 0        
Sales 0 0        
Repayments 0 0 0 0    
Settlements 0 (3)        
Closing balance 8 1 8 1    
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date (1) (3)        
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 out of Level 3     0 0    
Assets Level 3 Roll Forward:            
Opening balance 3,202 3,178 3,165 3,167 3,167  
Transfers out of Level 3 (1) 0 0        
Total gains/losses for the period:            
Included in earnings (1) (1) (1) (3)    
Included in OCI 24 0 70 37    
Purchases/originations 28 260 136 539    
Sales 0 0 0 0    
Repayments 0 0 0 0    
Settlements (159) (160) (276) (389)    
Closing balance 3,094 3,277 3,094 3,277 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    
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 out of Level 3     0   0  
Assets Level 3 Roll Forward:            
Opening balance 0   0 24 24  
Transfers out of Level 3 (1) 0          
Total gains/losses for the period:            
Included in earnings 0   0 (2) (2)  
Included in OCI 0   0   11  
Purchases/originations 55   55   0  
Sales 0   0   (33)  
Repayments 0   0   0  
Settlements 0   0   0  
Closing balance 55   55   0  
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0   0   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 28 34 30 38 38  
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    
Sales 0 0 0 0    
Repayments (1) (2) (3) (6)    
Settlements 0 0 0 0    
Closing balance 27 32 27 32 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 14,286   14,286   13,780  
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 1,239   1,239   1,583  
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 2,393   2,393   1,255  
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 11,127   11,127   10,610  
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 1,239   1,239   1,583  
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 $ 2,393   $ 2,393   $ 1,255