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Fair Value Measurements - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Weighted-average discount rates for fair value estimations 34.00%    
Historical recovery rate of collateral values of consumer installment loans 57.00%    
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 $ 69,000,000 $ 46,000,000  
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 133,000,000    
Capitalized servicing rights, valuation allowance   21,000,000  
Valuation Allowances Recorded 0 $ (3,000,000)  
Weighted-average prepayment speed   12.42%  
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 670,000,000 $ 392,000,000 $ 853,000,000
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 374,000,000 260,000,000 329,000,000
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 $ 296,000,000 $ 132,000,000 $ 524,000,000