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Fair Value Measurement - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis Quantitative Information about Level 3 Fair Value Measurements (Detail)
$ in Millions
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available for sale $ 45,888 $ 46,150    
Derivative assets, gross amount 1,221 1,539    
Recurring        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available for sale 45,888 46,150    
Derivative assets, gross amount 709 460    
Recurring | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available for sale 443 443    
Retained interests in securitizations 155 158    
Net derivative assets (liabilities) 6 (10) $ (9) $ 13
Derivative assets, gross amount 42 38 $ 36  
RMBS        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available for sale 34,865 33,645    
RMBS | Recurring        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available for sale 34,865 33,645    
RMBS | Recurring | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available for sale 434 433    
CMBS | Recurring        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available for sale 5,322 4,739    
CMBS | Recurring | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available for sale 9 10    
Other securities        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available for sale 1,574 1,622    
Other securities | Recurring        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available for sale 1,574 1,622    
Other securities | Recurring | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available for sale $ 0 $ 0    
Yield | RMBS | Recurring | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.02 0.03    
Yield | RMBS | Recurring | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.15 0.11    
Yield | RMBS | Recurring | Level 3 | Discounted cash flows | Weighted average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.05 0.05    
Yield | CMBS | Recurring | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.03 0.03    
Yield | CMBS | Recurring | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.03 0.03    
Yield | CMBS | Recurring | Level 3 | Discounted cash flows | Weighted average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.03 0.03    
Constant prepayment rate | Recurring | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Retained interests, measurement input 0.02 0.03    
Constant prepayment rate | Recurring | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Retained interests, measurement input 0.15 0.14    
Constant prepayment rate | RMBS | Recurring | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.00 0.00    
Constant prepayment rate | RMBS | Recurring | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.15 0.17    
Constant prepayment rate | RMBS | Recurring | Level 3 | Discounted cash flows | Weighted average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.07 0.05    
Default rate | Recurring | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Retained interests, measurement input 0.01 0.02    
Default rate | Recurring | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Retained interests, measurement input 0.04 0.04    
Default rate | RMBS | Recurring | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.00 0.00    
Default rate | RMBS | Recurring | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.07 0.07    
Default rate | RMBS | Recurring | Level 3 | Discounted cash flows | Weighted average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.03 0.03    
Loss severity | Recurring | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Retained interests, measurement input 0.52 0.50    
Loss severity | Recurring | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Retained interests, measurement input 0.98 1.04    
Loss severity | RMBS | Recurring | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.00 0.00    
Loss severity | RMBS | Recurring | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.85 0.75    
Loss severity | RMBS | Recurring | Level 3 | Discounted cash flows | Weighted average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Securities available-for-sale, measurement input 0.69 0.65    
Life of receivables (months) | Recurring | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Retained interests, measurement input, life of receivables 1 month 3 months    
Life of receivables (months) | Recurring | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Retained interests, measurement input, life of receivables 54 months 56 months    
Discount rate | Recurring | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Retained interests, measurement input 0.04 0.04    
Discount rate | Recurring | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Retained interests, measurement input 0.06 0.06    
Swap rates | Recurring | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Net derivative assets (liabilities) Net, measurement input 0.02 0.03    
Swap rates | Recurring | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Net derivative assets (liabilities) Net, measurement input 0.02 0.03    
Swap rates | Recurring | Level 3 | Discounted cash flows | Weighted average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Net derivative assets (liabilities) Net, measurement input 0.02 0.03