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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Measurement Input [Extensible List] us-gaap:MeasurementInputComparabilityAdjustmentMember   us-gaap:MeasurementInputComparabilityAdjustmentMember    
Weighted-average discount rates for fair value estimations     50.00%    
Historical recovery rate of collateral values of consumer installment loans     68.00%    
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 $ 73 $ 46 $ 117 $ 104  
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 123   123   $ 138
Capitalized servicing rights, valuation allowance     10   $ 24
Increase (decrease) in valuation allowance (11) 8 $ (14) (1)  
Weighted-average prepayment speeds     8.81%   14.64%
Discounted rate represented weighted-average option-adjusted basis spread point percentage     900.00%   900.00%
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 761 629 $ 761 629 $ 574
Assets taken in foreclosure of defaulted loans measured at fair value on a nonrecurring basis   10   10  
Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member]          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Assets taken in foreclosure of defaulted loans measured at fair value on a nonrecurring basis 1   1    
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 424 386 424 386 340
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 $ 337 $ 243 $ 337 $ 243 $ 234