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Fair Value Measurements - Quantitative Information about Nonrecurring Fair Value Measurement of Assets and Liabilities Classified as Level 3 (Detail) - Fair Value, Nonrecurring
$ in Millions
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Total assets at fair value on a non-recurring basis $ 547 $ 2,202
Consumer loans held for sale    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Total assets at fair value on a non-recurring basis 307 1,766
Commercial loans held for sale    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Total assets at fair value on a non-recurring basis 6 143
Commercial Loans    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Total assets at fair value on a non-recurring basis 138 186
Level 3    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Total assets at fair value on a non-recurring basis 418 2,001
Level 3 | Consumer loans held for sale    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Total assets at fair value on a non-recurring basis 280 1,742
Level 3 | Commercial loans held for sale    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Total assets at fair value on a non-recurring basis 0 68
Level 3 | Commercial Loans    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Total assets at fair value on a non-recurring basis $ 138 $ 186
Adjusted market price | Level 3 | Consumer loans held for sale | Minimum | Market comparables and internal assumptions    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Range of Inputs 0.08 0.10
Adjusted market price | Level 3 | Consumer loans held for sale | Maximum | Market comparables and internal assumptions    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Range of Inputs 0.95 1
Adjusted market price | Level 3 | Consumer loans held for sale | Weighted Average | Market comparables and internal assumptions    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Range of Inputs 0.93 0.98
Adjusted market price | Level 3 | Commercial loans held for sale | Market comparables and internal assumptions    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Range of Inputs   0.94
Loss severity rates | Level 3 | Commercial Loans | Minimum | Valuation of third party appraisal on underlying collateral    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Range of Inputs 0.02 0.02
Loss severity rates | Level 3 | Commercial Loans | Maximum | Valuation of third party appraisal on underlying collateral    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Range of Inputs 0.74 0.76
Loss severity rates | Level 3 | Commercial Loans | Weighted Average | Valuation of third party appraisal on underlying collateral    
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items]    
Range of Inputs 0.20 0.23