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 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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 $ (9) $ (1) $ (9) $ (1) $ 2 $ (1)
Assets Level 3 Roll Forward:            
Transfers into Level 3       0    
Transfers out of Level 3 (1)     (24) (14)    
Total gains/losses for the period:            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings     31 16    
Included in OCI (3)   (46)      
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 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss)     6 (2)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Issues       0    
MSRs            
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 10 12 10 11 11  
Transfers out of Level 3 (1) 0 0        
Total gains/losses for the period:            
Included in earnings 1 (1) 1 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 9 11 9 11 10  
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 1 (1) 1 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances       0    
Derivative instruments            
Assets Level 3 Roll Forward:            
Opening balance 5 0        
Transfers out of Level 3 (1) (15) (9)        
Total gains/losses for the period:            
Included in earnings (19) (10)        
Included in OCI 0 0        
Purchases/originations 0 0        
Sales 0 0        
Repayments 0 0 0 0    
Settlements 0 0        
Closing balance 9 1 9 1    
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 4 (2)        
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 3,237 3,230 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) 0 (2)    
Included in OCI (3) 9 46 (37)    
Purchases/originations 28 86 108 279    
Sales 0 0 0 0    
Repayments 0 0 0 0    
Settlements (65) (128) (117) (229)    
Closing balance 3,202 3,178 3,202 3,178 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    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances       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     0 24 24  
Total gains/losses for the period:            
Included in earnings       (2) (2)  
Included in OCI         (11)  
Purchases/originations         0  
Sales         (33)  
Repayments         0  
Settlements         0  
Closing balance         0  
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date         0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances         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    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3     0 0    
Assets Level 3 Roll Forward:            
Opening balance 29 37 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) (3) (2) (4)    
Settlements 0 0 0 0    
Closing balance 28 34 28 34 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, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances       $ 0    
Fair Value, Measurements, Recurring [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Available-for-sale securities 13,695   13,695   13,780  
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Available-for-sale securities 1,460   1,460   1,583  
Fair Value, Measurements, Recurring [Member] | Residential Mortgage Backed Securities [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Available-for-sale securities 1,880   1,880   1,255  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Available-for-sale securities 10,482   10,482   10,610  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Available-for-sale securities 1,460   1,460   1,583  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Residential Mortgage Backed Securities [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Available-for-sale securities $ 1,880   $ 1,880   $ 1,255