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Fair Value Of Financial Instruments (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Percentage of level 3 assets at fair value in total assets measured at fair value value 4.00%   4.00%   20.00%
Percentage of level 3 liabilities at fair value in total liabilities measured at fair value 70.00%   70.00%   68.00%
Cumulative changes in instrument-specific credit risk of liabilities elected under the fair value option $ (103)   $ (103)   $ (115)
Loan Repurchase Commitments [Member]          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Payments for Litigation Settlements     600    
Instrument-specific credit risk of liabilities measured at fair value, net [Member]          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Cumulative changes in instrument-specific credit risk of liabilities elected under the fair value option 26   26   $ 51
Loss on instrument-specific credit risk recognized in earnings $ 4 $ 1 $ 24 $ 3