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Fair Values of Assets and Liabilities - Changes in Fair Value for All Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Other Noninterest Income [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net gains and (losses) on net derivative assets and liabilities included in net income $ 1 $ 1   $ 1
Net Change in net derivative asset and liability unrealized gains (losses) relating to assets still held at end of period 1 1   1
Mortgage Banking Revenue [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net gains and (losses) on net derivative assets and liabilities included in net income (20) 276 $ (103) 336
Net Change in net derivative asset and liability unrealized gains (losses) relating to assets still held at end of period (3) 100 (3) 100
Commercial Products Revenue [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net gains and (losses) on net derivative assets and liabilities included in net income (1,500) 279 (3,300) (716)
Net Change in net derivative asset and liability unrealized gains (losses) relating to assets still held at end of period $ (1,300) $ 311 $ (2,700) $ (597)