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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
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
$ / SecurityLoan
Jun. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale $ 47,384 $ 37,655        
Consumer MSRs   92        
Fair Value, Measurements, Recurring [Member]            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale 47,384 37,655        
Fair Value, Measurements, Recurring [Member] | Level 3            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale 530 633        
Consumer MSRs   92        
Retained interests in securitizations 162 172        
Net derivative assets (liabilities) $ 13 $ 13 $ (5) $ 27 $ 25 $ 18
Measurement Input, Life of Receivables [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Retained Interest, Measurement Input, life of receivables 1 month 6 months        
Measurement Input, Life of Receivables [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Retained Interest, Measurement Input, life of receivables 56 months 79 months        
Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Retained Interest, Measurement Input 0.02 0.02        
Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Retained Interest, Measurement Input 0.13 0.12        
Measurement Input, Default Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Retained Interest, Measurement Input 0.02 0.01        
Measurement Input, Default Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Retained Interest, Measurement Input 0.05 0.06        
Measurement Input, Loss Severity [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Retained Interest, Measurement Input 0.55 0.03        
Measurement Input, Loss Severity [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Retained Interest, Measurement Input 1.11 1.15        
Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Retained Interest, Measurement Input 0.03 0.03        
Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Retained Interest, Measurement Input 0.05 0.10        
Measurement Input, Swap Rates [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Derivative Asset (Liability) Net, Measurement Input 0.03 0.02        
Measurement Input, Swap Rates [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Derivative Asset (Liability) Net, Measurement Input 0.03 0.02        
Measurement Input, Swap Rates [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Derivative Asset (Liability) Net, Measurement Input 0.03 0.02        
RMBS            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale $ 34,865 $ 27,792        
RMBS | Fair Value, Measurements, Recurring [Member]            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale 34,865 27,792        
RMBS | Fair Value, Measurements, Recurring [Member] | Level 3            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale $ 519 $ 614        
RMBS | Measurement Input, Yield [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.02 0.02        
RMBS | Measurement Input, Yield [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.10 0.09        
RMBS | Measurement Input, Yield [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.05 0.05        
RMBS | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.00 0.00        
RMBS | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.17 0.15        
RMBS | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.04 0.04        
RMBS | Measurement Input, Default Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.00 0.00        
RMBS | Measurement Input, Default Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.07 0.08        
RMBS | Measurement Input, Default Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.03 0.03        
RMBS | Measurement Input, Loss Severity [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.00 0.00        
RMBS | Measurement Input, Loss Severity [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.90 0.90        
RMBS | Measurement Input, Loss Severity [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.65 0.62        
Other securities            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale $ 1,313 $ 1,005        
Other securities | Fair Value, Measurements, Recurring [Member]            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale 1,313 1,005        
Other securities | Fair Value, Measurements, Recurring [Member] | Level 3            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale 0 $ 5        
Other securities | Measurement Input, Yield [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input   0.02        
Other securities | Measurement Input, Yield [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input   0.02        
Other securities | Measurement Input, Yield [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input   0.02        
Consumer MSRs | Fair Value, Measurements, Recurring [Member] | Level 3            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Consumer MSRs   $ 92        
Consumer MSRs | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Servicing Asset, Measurement Input   0.07        
Consumer MSRs | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Servicing Asset, Measurement Input   0.30        
Consumer MSRs | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Servicing Asset, Measurement Input   0.16        
Consumer MSRs | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Servicing Asset, Measurement Input   0.14        
Consumer MSRs | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Servicing Asset, Measurement Input   0.14        
Consumer MSRs | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Servicing Asset, Measurement Input   0.14        
Consumer MSRs | Measurement Input, Option Adjusted Spread Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Servicing Asset, Measurement Input   0.02        
Consumer MSRs | Measurement Input, Option Adjusted Spread Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Servicing Asset, Measurement Input   0.15        
Consumer MSRs | Measurement Input, Option Adjusted Spread Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Servicing Asset, Measurement Input   0.0458        
Consumer MSRs | Measurement Input, Servicing Cost [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Servicing Asset, Measurement Input   75        
Consumer MSRs | Measurement Input, Servicing Cost [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Servicing Asset, Measurement Input   100        
Consumer MSRs | Measurement Input, Servicing Cost [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Servicing Asset, Measurement Input | $ / SecurityLoan   76        
CMBS | Fair Value, Measurements, Recurring [Member]            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale 4,923 $ 3,175        
CMBS | Fair Value, Measurements, Recurring [Member] | Level 3            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale $ 11 $ 14        
CMBS | Measurement Input, Yield [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.04 0.03        
CMBS | Measurement Input, Yield [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.04 0.03        
CMBS | Measurement Input, Yield [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input 0.04 0.03        
CMBS | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input   0.00        
CMBS | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input   0.00        
CMBS | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt Securities, Available-for-sale, Measurement Input   0.00