Annual report pursuant to Section 13 and 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Classification of Gains/Losses (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Classification of Gains/Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivatives gain (loss) included in earnings   $ 66 $ 35 $ 16
MSRs        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings   (3) (1) (3)
Municipal securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings   (1) (3) (2)
Asset-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings   0 (2) (5)
Automobile        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings $ 1 1 0 1
Mortgage banking income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivatives gain (loss) included in earnings   66 35 16
Mortgage banking income | MSRs        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings   (3) (1) (3)
Mortgage banking income | Municipal securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings   0 0 0
Mortgage banking income | Asset-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings     0 0
Mortgage banking income | Automobile        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings 0     0
Securities gains (losses)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivatives gain (loss) included in earnings     0 0
Securities gains (losses) | MSRs        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings     0 0
Securities gains (losses) | Municipal securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings     0 0
Securities gains (losses) | Asset-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings     (2) (5)
Securities gains (losses) | Automobile        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings       0
Interest and fee income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivatives gain (loss) included in earnings   0 0 0
Interest and fee income | MSRs        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings   0 0 0
Interest and fee income | Municipal securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings   $ (1) (3) (2)
Interest and fee income | Asset-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings     $ 0 0
Interest and fee income | Automobile        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings $ 1     0
Noninterest income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivatives gain (loss) included in earnings       0
Noninterest income | MSRs        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings       0
Noninterest income | Municipal securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings       0
Noninterest income | Asset-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings       0
Noninterest income | Automobile        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Assets gain (loss) included in earnings       $ 1