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Fair Value Measurement - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Securities available for sale:      
Securities available for sale $ 50,691 $ 37,655  
Derivative Assets, Gross Amount 1,416 1,040  
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (533) (275)  
Other assets:      
Consumer MSRs   92  
Liabilities:      
Derivative Liabilities, Gross Amount 1,514 1,268  
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (880) (662)  
Net valuation allowance 2 2  
Fair Value, Measurements, Recurring [Member]      
Securities available for sale:      
Securities available for sale 50,691 37,655  
Derivative Assets, Gross Amount 883 765  
Other assets:      
Other assets, fair value 453 545  
Total assets 52,027 38,965  
Liabilities:      
Derivative Liabilities, Gross Amount 634 606  
Total liabilities 634 606  
Fair Value, Measurements, Recurring [Member] | Level 1      
Securities available for sale:      
Securities available for sale 8,816 5,491  
Derivative Assets, Gross Amount 0 1  
Other assets:      
Other assets, fair value 289 281  
Deferred compensation plan assets 288 281  
Equity securities 1    
Total assets 9,105 5,773  
Liabilities:      
Derivative Liabilities, Gross Amount 0 1  
Total liabilities 0 1  
Fair Value, Measurements, Recurring [Member] | Level 2      
Securities available for sale:      
Securities available for sale 41,417 31,531  
Derivative Assets, Gross Amount 1,373 1,002  
Other assets:      
Other assets, fair value 0 0  
Total assets 42,790 32,533  
Liabilities:      
Derivative Liabilities, Gross Amount 1,466 1,243  
Total liabilities 1,466 1,243  
Fair Value, Measurements, Recurring [Member] | Level 3      
Securities available for sale:      
Securities available for sale 458 633  
Derivative Assets, Gross Amount 43 37 $ 57
Other assets:      
Other assets, fair value 164 264  
Retained interests in securitizations 164 172  
Consumer MSRs   92  
Total assets 665 934  
Liabilities:      
Derivative Liabilities, Gross Amount 48 24 $ 32
Total liabilities 48 24  
US Treasury securities | Fair Value, Measurements, Recurring [Member]      
Securities available for sale:      
Securities available for sale 8,624 5,171  
US Treasury securities | Fair Value, Measurements, Recurring [Member] | Level 1      
Securities available for sale:      
Securities available for sale 8,624 5,171  
US Treasury securities | Fair Value, Measurements, Recurring [Member] | Level 2      
Securities available for sale:      
Securities available for sale 0 0  
US Treasury securities | Fair Value, Measurements, Recurring [Member] | Level 3      
Securities available for sale:      
Securities available for sale 0 0  
RMBS | Fair Value, Measurements, Recurring [Member]      
Securities available for sale:      
Securities available for sale 35,682 27,792  
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 35,240 27,178  
RMBS | Fair Value, Measurements, Recurring [Member] | Level 3      
Securities available for sale:      
Securities available for sale 442 614  
CMBS | Fair Value, Measurements, Recurring [Member]      
Securities available for sale:      
Securities available for sale 4,763 3,175  
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 4,752 3,161  
CMBS | Fair Value, Measurements, Recurring [Member] | Level 3      
Securities available for sale:      
Securities available for sale 11 14  
Other ABS | Fair Value, Measurements, Recurring [Member]      
Securities available for sale:      
Securities available for sale 294 512  
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 294 512  
Other ABS | Fair Value, Measurements, Recurring [Member] | Level 3      
Securities available for sale:      
Securities available for sale 0 0  
Other securities | Fair Value, Measurements, Recurring [Member]      
Securities available for sale:      
Securities available for sale 1,328 1,005  
Other securities | Fair Value, Measurements, Recurring [Member] | Level 1      
Securities available for sale:      
Securities available for sale 192 320  
Other securities | Fair Value, Measurements, Recurring [Member] | Level 2      
Securities available for sale:      
Securities available for sale 1,131 680  
Other securities | Fair Value, Measurements, Recurring [Member] | Level 3      
Securities available for sale:      
Securities available for sale $ 5 $ 5