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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Measurement Input [Extensible List] us-gaap:MeasurementInputComparabilityAdjustmentMember    
Minimum [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Discount rates for fair value estimations 15.00%    
Maximum [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Discount rates for fair value estimations 90.00%    
Significant Unobservable Inputs (Level 3) [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Change in fair value of nonrecurring fair value measured loans for charge-offs and impairment reserves $ 46 $ 66  
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Loans [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Capitalized servicing rights 133   $ 138
Capitalized servicing rights, valuation allowance $ 21   $ 24
Valuation Charge Recognized   9  
Weighted-average prepayment speeds 12.42%   14.64%
Discounted rate represented weighted-average option-adjusted basis spread point percentage 900.00%   900.00%
Capitalized servicing rights, amortization increase (decrease) $ 3    
Fair Value, Measurements, Nonrecurring [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Loans measured at fair value on nonrecurring basis 392 658 $ 574
Assets taken in foreclosure of defaulted loans measured at fair value on a nonrecurring basis   9  
Fair Value, Measurements, Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Loans measured at fair value on nonrecurring basis 260 357 340
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Loans measured at fair value on nonrecurring basis $ 132 $ 301 $ 234