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Fair Value Measurement - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Securities available for sale:    
Securities available for sale $ 39,431 $ 39,508
Other assets:    
Consumer MSRs 63 53
Derivative Assets, Gross Amount 1,911 1,452
Liabilities:    
Derivative Liabilities, Gross Amount 472 339
Derivative Liabilities 291 175
Derivative Asset 1,428 828
Derivative Credit Risk Valuation Adjustment, Derivative Assets (Liabilities) 4 4
Fair Value, Measurements, Recurring [Member]    
Securities available for sale:    
Securities available for sale 39,431 39,508
Other assets:    
Consumer MSRs 63 53
Derivative Assets, Gross Amount 1,911 1,452
Retained interests in securitizations 214 221
Total assets 41,619 41,234
Liabilities:    
Derivative Liabilities, Gross Amount 472 339
Total liabilities 472 339
Fair Value, Measurements, Recurring [Member] | Level 1    
Securities available for sale:    
Securities available for sale 4,563 4,228
Other assets:    
Consumer MSRs 0 0
Derivative Assets, Gross Amount 2 4
Retained interests in securitizations 0 0
Total assets 4,565 4,232
Liabilities:    
Derivative Liabilities, Gross Amount 4 3
Total liabilities 4 3
Fair Value, Measurements, Recurring [Member] | Level 2    
Securities available for sale:    
Securities available for sale 34,189 34,075
Other assets:    
Consumer MSRs 0 0
Derivative Assets, Gross Amount 1,844 1,382
Retained interests in securitizations 0 0
Total assets 36,033 35,457
Liabilities:    
Derivative Liabilities, Gross Amount 433 293
Total liabilities 433 293
Fair Value, Measurements, Recurring [Member] | Level 3    
Securities available for sale:    
Securities available for sale 679 1,205
Other assets:    
Consumer MSRs 63 53
Derivative Assets, Gross Amount 65 66
Retained interests in securitizations 214 221
Total assets 1,021 1,545
Liabilities:    
Derivative Liabilities, Gross Amount 35 43
Total liabilities 35 43
US Treasury securities | Fair Value, Measurements, Recurring [Member]    
Securities available for sale:    
Securities available for sale 4,445 4,118
US Treasury securities | Fair Value, Measurements, Recurring [Member] | Level 1    
Securities available for sale:    
Securities available for sale 4,445 4,117
US Treasury securities | Fair Value, Measurements, Recurring [Member] | Level 2    
Securities available for sale:    
Securities available for sale 0 1
US Treasury securities | Fair Value, Measurements, Recurring [Member] | Level 3    
Securities available for sale:    
Securities available for sale 0 0
Corporate debt securities guaranteed by U.S. government agencies | Fair Value, Measurements, Recurring [Member]    
Securities available for sale:    
Securities available for sale 355 800
Corporate debt securities guaranteed by U.S. government agencies | Fair Value, Measurements, Recurring [Member] | Level 1    
Securities available for sale:    
Securities available for sale 0 0
Corporate debt securities guaranteed by U.S. government agencies | Fair Value, Measurements, Recurring [Member] | Level 2    
Securities available for sale:    
Securities available for sale 312 467
Corporate debt securities guaranteed by U.S. government agencies | Fair Value, Measurements, Recurring [Member] | Level 3    
Securities available for sale:    
Securities available for sale 43 333
RMBS | Fair Value, Measurements, Recurring [Member]    
Securities available for sale:    
Securities available for sale 27,765 25,381
RMBS | Fair Value, Measurements, Recurring [Member] | Level 1    
Securities available for sale:    
Securities available for sale 0 0
RMBS | Fair Value, Measurements, Recurring [Member] | Level 2    
Securities available for sale:    
Securities available for sale 27,246 24,820
RMBS | Fair Value, Measurements, Recurring [Member] | Level 3    
Securities available for sale:    
Securities available for sale 519 561
CMBS | Fair Value, Measurements, Recurring [Member]    
Securities available for sale:    
Securities available for sale 5,220 5,519
CMBS | Fair Value, Measurements, Recurring [Member] | Level 1    
Securities available for sale:    
Securities available for sale 0 0
CMBS | Fair Value, Measurements, Recurring [Member] | Level 2    
Securities available for sale:    
Securities available for sale 5,115 5,291
CMBS | Fair Value, Measurements, Recurring [Member] | Level 3    
Securities available for sale:    
Securities available for sale 105 228
Other ABS | Fair Value, Measurements, Recurring [Member]    
Securities available for sale:    
Securities available for sale 1,483 2,662
Other ABS | Fair Value, Measurements, Recurring [Member] | Level 1    
Securities available for sale:    
Securities available for sale 0 0
Other ABS | Fair Value, Measurements, Recurring [Member] | Level 2    
Securities available for sale:    
Securities available for sale 1,483 2,597
Other ABS | Fair Value, Measurements, Recurring [Member] | Level 3    
Securities available for sale:    
Securities available for sale 0 65
Other securities | Fair Value, Measurements, Recurring [Member]    
Securities available for sale:    
Securities available for sale 163 1,028
Other securities | Fair Value, Measurements, Recurring [Member] | Level 1    
Securities available for sale:    
Securities available for sale 118 111
Other securities | Fair Value, Measurements, Recurring [Member] | Level 2    
Securities available for sale:    
Securities available for sale 33 899
Other securities | Fair Value, Measurements, Recurring [Member] | Level 3    
Securities available for sale:    
Securities available for sale $ 12 $ 18