Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Classification of Gains/Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net derivatives gain (loss) included in earnings $ 233 $ 66 $ 35
MSRs      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings (104) (3) (1)
Municipal securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings (2) (1) (3)
Asset-backed securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 0 0 (2)
Loans held for investment      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings   1  
Mortgage banking income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net derivatives gain (loss) included in earnings 233 66 35
Mortgage banking income | MSRs      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings (104) (3) (1)
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
Mortgage banking income | Loans held for investment      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings   0  
Securities gains (losses)      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net derivatives gain (loss) included in earnings     0
Securities gains (losses) | MSRs      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings     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
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)
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 $ (2) (1) (3)
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
Interest and fee income | Loans held for investment      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings   $ 1