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
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Total gains/losses for the period:      
Included in OCI $ (43)    
MSRs      
Assets Level 3 Roll Forward:      
Opening balance 10 $ 11  
Transfers out of Level 3 (1) 0 0  
Total gains/losses for the period:      
Included in earnings 0 1  
Included in OCI 0 0  
Purchases/originations 0 0  
Sales 0 0  
Repayments 0 0  
Settlements 0 0  
Closing balance 10 12  
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0 1  
Derivative instruments      
Assets Level 3 Roll Forward:      
Opening balance 2 (1)  
Transfers out of Level 3 (1) (9) (5)  
Total gains/losses for the period:      
Included in earnings (12) (6)  
Included in OCI 0 0  
Purchases/originations 0 0  
Sales 0 0  
Repayments 0 0  
Settlements 0 0  
Closing balance 5 0  
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 2 0  
Municipal securities      
Assets Level 3 Roll Forward:      
Opening balance 3,165 3,167  
Transfers out of Level 3 (1) 0 0  
Total gains/losses for the period:      
Included in earnings 1 (1)  
Included in OCI (43) 28  
Purchases/originations 81 193  
Sales 0 0  
Repayments 0 0  
Settlements (53) (101)  
Closing balance 3,237 3,230  
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0 0  
Asset-backed Securities [Member]      
Assets Level 3 Roll Forward:      
Opening balance   24  
Transfers out of Level 3 (1)   0  
Total gains/losses for the period:      
Included in earnings   (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  
Automobile      
Assets Level 3 Roll Forward:      
Opening balance 30 38  
Transfers out of Level 3 (1) 0 0  
Total gains/losses for the period:      
Included in earnings 0 0  
Included in OCI 0 0  
Purchases/originations 0 0  
Sales 0 0  
Repayments (1) (1)  
Settlements 0 0  
Closing balance 29 37  
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0 $ 0  
Fair Value, Measurements, Recurring [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Available-for-sale securities 13,982   $ 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 1,553   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 1,373   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 10,740   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 1,553   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 $ 1,373   $ 1,255