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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 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     37.00%    
Historical recovery rate of collateral values of consumer installment loans     66.00%    
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 $ 38 $ 35 $ 128 $ 125  
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         $ 138
Capitalized servicing rights, valuation allowance         $ 24
Increase (decrease) in valuation allowance (10)   (4) (1)  
Weighted-average prepayment speeds         14.64%
Discounted rate represented weighted-average option-adjusted basis spread point percentage         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 706 591 706 591 $ 574
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 439 330 439 330 340
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 $ 267 $ 261 $ 267 $ 261 $ 234