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Fair Value Measurement - Schedule of Assets Measured at Fair Value on Recurring Basis Quantitative Information about Level 3 Fair Value Measurements (Detail)
$ in Millions
Sep. 30, 2015
USD ($)
$ / SecurityLoan
Dec. 31, 2014
USD ($)
$ / SecurityLoan
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale $ 39,431 $ 39,508
Consumer MSRs 63 53
Derivative Assets, Gross Amount 1,911 1,452
Fair Value Inputs [Abstract]    
Derivative Credit Risk Valuation Adjustment, Derivative Assets (Liabilities) 4 4
Level 3 | Retained interest in securitizations    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Retained interests in securitizations 214  
Fair Value, Measurements, Recurring [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale 39,431 39,508
Consumer MSRs 63 53
Derivative Assets, Gross Amount 1,911 1,452
Retained interests in securitizations 214 221
Fair Value Inputs [Abstract]    
Assets, Fair Value Disclosure 41,619 41,234
Fair Value, Measurements, Recurring [Member] | RMBS    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale 27,765 25,381
Fair Value, Measurements, Recurring [Member] | CMBS    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale 5,220 5,519
Fair Value, Measurements, Recurring [Member] | Other ABS    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale 1,483 2,662
Fair Value, Measurements, Recurring [Member] | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale 679 1,205
Consumer MSRs 63 53
Derivative Assets, Gross Amount 65 66
Retained interests in securitizations 214 221
Fair Value Inputs [Abstract]    
Assets, Fair Value Disclosure 1,021 1,545
Fair Value, Measurements, Recurring [Member] | Level 3 | RMBS    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale $ 519 $ 561
Fair Value, Measurements, Recurring [Member] | Level 3 | RMBS | Discounted cash flows | Minimum [Member]    
Fair Value Inputs [Abstract]    
Yield (percent) 1.00% 0.00%
Constant prepayment rate (percent) 0.00% 0.00%
Default rate (percent) 0.00% 0.00%
Loss severity (percent) 0.00% 0.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | RMBS | Discounted cash flows | Maximum [Member]    
Fair Value Inputs [Abstract]    
Yield (percent) 19.00% 18.00%
Constant prepayment rate (percent) 21.00% 23.00%
Default rate (percent) 19.00% 15.00%
Loss severity (percent) 85.00% 85.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | RMBS | Discounted cash flows | Weighted Average    
Fair Value Inputs [Abstract]    
Yield (percent) 6.00% 6.00%
Constant prepayment rate (percent) 4.00% 4.00%
Default rate (percent) 5.00% 5.00%
Loss severity (percent) 56.00% 55.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | CMBS    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale $ 105 $ 228
Fair Value, Measurements, Recurring [Member] | Level 3 | CMBS | Discounted cash flows | Minimum [Member]    
Fair Value Inputs [Abstract]    
Yield (percent) 2.00% 1.00%
Constant prepayment rate (percent) 0.00% 0.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | CMBS | Discounted cash flows | Maximum [Member]    
Fair Value Inputs [Abstract]    
Yield (percent) 3.00% 4.00%
Constant prepayment rate (percent) 15.00% 100.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | CMBS | Discounted cash flows | Weighted Average    
Fair Value Inputs [Abstract]    
Yield (percent) 2.00% 1.00%
Constant prepayment rate (percent) 6.00% 5.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | Other ABS    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale $ 0 $ 65
Fair Value, Measurements, Recurring [Member] | Level 3 | Other ABS | Discounted cash flows | Minimum [Member]    
Fair Value Inputs [Abstract]    
Yield (percent) 2.00%
Constant prepayment rate (percent) 0.00%
Default rate (percent) 1.00%
Loss severity (percent) 30.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | Other ABS | Discounted cash flows | Maximum [Member]    
Fair Value Inputs [Abstract]    
Yield (percent) 7.00%
Constant prepayment rate (percent) 3.00%
Default rate (percent) 10.00%
Loss severity (percent) 88.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | Other ABS | Discounted cash flows | Weighted Average    
Fair Value Inputs [Abstract]    
Yield (percent) 5.00%
Constant prepayment rate (percent) 2.00%
Default rate (percent) 7.00%
Loss severity (percent) 71.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | US Government-sponsored Enterprises Debt Securities and Other Securities [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale $ 55 $ 351
Fair Value, Measurements, Recurring [Member] | Level 3 | US Government-sponsored Enterprises Debt Securities and Other Securities [Member] | Discounted cash flows | Minimum [Member]    
Fair Value Inputs [Abstract]    
Yield (percent) 2.00% 1.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | US Government-sponsored Enterprises Debt Securities and Other Securities [Member] | Discounted cash flows | Maximum [Member]    
Fair Value Inputs [Abstract]    
Yield (percent) 3.00% 4.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | US Government-sponsored Enterprises Debt Securities and Other Securities [Member] | Discounted cash flows | Weighted Average    
Fair Value Inputs [Abstract]    
Yield (percent) 2.00% 3.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | Consumer MSRs    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Consumer MSRs $ 63  
Fair Value, Measurements, Recurring [Member] | Level 3 | Consumer MSRs | Discounted cash flows | Minimum [Member]    
Fair Value Inputs [Abstract]    
Total prepayment rate (percent) 11.00% 12.00%
Discount rate (percent) 12.00% 12.00%
Option adjusted spread rate (percent) 4.35% 4.35%
Servicing cost ($ per loan) | $ / SecurityLoan 93 93
Fair Value, Measurements, Recurring [Member] | Level 3 | Consumer MSRs | Discounted cash flows | Maximum [Member]    
Fair Value Inputs [Abstract]    
Total prepayment rate (percent) 19.00% 27.00%
Discount rate (percent) 12.00% 12.00%
Option adjusted spread rate (percent) 15.00% 15.00%
Servicing cost ($ per loan) | $ / SecurityLoan 213 209
Fair Value, Measurements, Recurring [Member] | Level 3 | Consumer MSRs | Discounted cash flows | Weighted Average    
Fair Value Inputs [Abstract]    
Total prepayment rate (percent) 16.00% 18.00%
Discount rate (percent) 12.00% 12.00%
Option adjusted spread rate (percent) 4.79% 4.78%
Servicing cost ($ per loan) | $ / SecurityLoan 100 101
Fair Value, Measurements, Recurring [Member] | Level 3 | Derivative assets    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Derivative Assets, Gross Amount $ 65  
Fair Value, Measurements, Recurring [Member] | Level 3 | Derivative assets | Discounted cash flows | Minimum [Member]    
Fair Value Inputs [Abstract]    
Swap rates (percent) 2.00% 2.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | Derivative assets | Discounted cash flows | Maximum [Member]    
Fair Value Inputs [Abstract]    
Swap rates (percent) 2.00% 3.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | Derivative assets | Discounted cash flows | Weighted Average    
Fair Value Inputs [Abstract]    
Swap rates (percent) 2.00% 2.00%
Fair Value, Measurements, Recurring [Member] | Level 3 | Retained interest in securitizations | Discounted cash flows | Minimum [Member]    
Fair Value Inputs [Abstract]    
Constant prepayment rate (percent) 2.00% 2.00%
Default rate (percent) 2.00% 2.00%
Loss severity (percent) 19.00% 19.00%
Discount rate (percent) 4.00% 4.00%
Life of receivables (months) 18 months 25 months
Fair Value, Measurements, Recurring [Member] | Level 3 | Retained interest in securitizations | Discounted cash flows | Maximum [Member]    
Fair Value Inputs [Abstract]    
Constant prepayment rate (percent) 15.00% 13.00%
Default rate (percent) 7.00% 8.00%
Loss severity (percent) 99.00% 95.00%
Discount rate (percent) 8.00% 9.00%
Life of receivables (months) 69 months 72 months
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Minimum [Member]    
Fair Value Inputs [Abstract]    
Swap rates (percent) 2.00% 2.00%
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Maximum [Member]    
Fair Value Inputs [Abstract]    
Swap rates (percent) 2.00% 3.00%
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Discounted cash flows | Weighted Average    
Fair Value Inputs [Abstract]    
Swap rates (percent) 2.00% 2.00%