Quarterly report pursuant to Section 13 or 15(d)

Securities - Amortized Cost, Gains and Losses, and Fair Value Available-for-sale (Details)

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Securities - Amortized Cost, Gains and Losses, and Fair Value Available-for-sale (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Available-for-sale Debt Securities:        
Amortized Cost $ 298,096 $ 296,579    
Gross Unrealized Gains 1,204 1,280    
Gross Unrealized Losses (3,400) (3,300)    
Fair Value 295,900 294,559    
Less: Available-for-sale securities of business held for sale (691) (619)    
Other Debt Securities, Carried at Fair Value:        
Amortized Cost 16,714 19,748    
Gross Unrealized Gains 164 121    
Gross Unrealized Losses (75) (149)    
Fair Value 16,803 19,720    
Debt securities carried at fair value:        
Amortized Cost 314,119 315,708    
Gross Unrealized Gains 1,368 1,401    
Gross Unrealized Losses (3,475) (3,449)    
Debt securities carried at fair value 312,012 313,660    
Held-to-maturity Securities:        
Amortized Cost 116,033 117,071    
Gross Unrealized Gains 166 248    
Gross Unrealized Losses (2,196) (2,034)    
Held-to-maturity, fair value 114,003 115,285    
Debt securities:        
Amortized Cost 430,152 432,779    
Gross Unrealized Gains 1,534 1,649    
Gross Unrealized Losses (5,671) (5,483)    
Fair Value 426,015 428,945    
Available-for-sale Equity Securities:        
Shareholders’ equity 268,153 266,840 $ 263,004 $ 256,176
Nonperforming Financing Receivable        
Available-for-sale Debt Securities:        
Debt securities carried at fair value 121 121    
FNMA        
Debt securities carried at fair value:        
Amortized Cost 156,500 156,400    
Debt securities carried at fair value 154,300 154,400    
FHLMC        
Debt securities carried at fair value:        
Amortized Cost 47,900 48,700    
Debt securities carried at fair value 47,400 48,300    
Other assets        
Available-for-sale Equity Securities:        
Amortized Cost 8 325    
Gross Unrealized Gains 57 51    
Gross Unrealized Losses 0 (1)    
Fair Value 65 375    
Agency        
Available-for-sale Debt Securities:        
Amortized Cost 190,684 190,809    
Gross Unrealized Gains 553 640    
Gross Unrealized Losses (2,194) (1,963)    
Debt securities carried at fair value 189,043 189,486    
Debt securities carried at fair value:        
Debt securities carried at fair value 189,043      
Agency-collateralized mortgage obligations        
Available-for-sale Debt Securities:        
Amortized Cost 7,848 8,296    
Gross Unrealized Gains 78 85    
Gross Unrealized Losses (49) (51)    
Debt securities carried at fair value 7,877 8,330    
Other Debt Securities, Carried at Fair Value:        
Fair Value 5 5    
Debt securities carried at fair value:        
Debt securities carried at fair value 7,882      
Commercial        
Available-for-sale Debt Securities:        
Amortized Cost 12,809 12,594    
Gross Unrealized Gains 27 21    
Gross Unrealized Losses (264) (293)    
Debt securities carried at fair value 12,572 12,322    
Debt securities carried at fair value:        
Debt securities carried at fair value 12,572      
Non-agency residential        
Available-for-sale Debt Securities:        
Amortized Cost 1,758 1,863    
Gross Unrealized Gains 209 181    
Gross Unrealized Losses (24) (31)    
Debt securities carried at fair value 1,943 2,013    
Other Debt Securities, Carried at Fair Value:        
Fair Value 3,082 $ 3,139    
Debt securities carried at fair value:        
Debt securities carried at fair value $ 5,025      
Non-agency residential | Prime        
Available-for-sale Equity Securities:        
Available-for-sale securities, percent held by rating 60.00% 60.00%    
Non-agency residential | Alt-A        
Available-for-sale Equity Securities:        
Available-for-sale securities, percent held by rating 19.00% 19.00%    
Non-agency residential | Subprime        
Available-for-sale Equity Securities:        
Available-for-sale securities, percent held by rating 21.00% 21.00%    
Mortgage-backed securities        
Available-for-sale Debt Securities:        
Amortized Cost $ 213,099 $ 213,562    
Gross Unrealized Gains 867 927    
Gross Unrealized Losses (2,531) (2,338)    
Debt securities carried at fair value 211,435 212,151    
Other Debt Securities, Carried at Fair Value:        
Fair Value 3,087 3,144    
Debt securities carried at fair value:        
Debt securities carried at fair value 214,522      
U.S. Treasury and agency securities        
Available-for-sale Debt Securities:        
Amortized Cost 51,056 48,800    
Gross Unrealized Gains 168 204    
Gross Unrealized Losses (666) (752)    
Debt securities carried at fair value 50,558 48,252    
Debt securities carried at fair value:        
Debt securities carried at fair value 50,558      
Non-U.S. securities        
Available-for-sale Debt Securities:        
Amortized Cost 6,744 6,372    
Gross Unrealized Gains 13 13    
Gross Unrealized Losses (4) (3)    
Fair Value 6,753 6,382    
Other Debt Securities, Carried at Fair Value:        
Fair Value 13,482 16,336    
Debt securities carried at fair value:        
Debt securities carried at fair value 20,235      
Other taxable securities, substantially all asset-backed securities        
Available-for-sale Debt Securities:        
Amortized Cost 9,754 10,573    
Gross Unrealized Gains 76 64    
Gross Unrealized Losses (11) (23)    
Debt securities carried at fair value 9,819 10,614    
Other Debt Securities, Carried at Fair Value:        
Fair Value 234 240    
Debt securities carried at fair value:        
Debt securities carried at fair value 10,053      
Total taxable securities        
Available-for-sale Debt Securities:        
Amortized Cost 280,653 279,307    
Gross Unrealized Gains 1,124 1,208    
Gross Unrealized Losses (3,212) (3,116)    
Fair Value 278,565 277,399    
Debt securities carried at fair value:        
Debt securities carried at fair value 295,368      
Tax-exempt securities        
Available-for-sale Debt Securities:        
Amortized Cost 17,443 17,272    
Gross Unrealized Gains 80 72    
Gross Unrealized Losses (188) (184)    
Debt securities carried at fair value 17,335 17,160    
Debt securities carried at fair value:        
Debt securities carried at fair value 17,335      
Debt securities        
Debt securities carried at fair value:        
Debt securities carried at fair value 312,703      
Available-for-sale Equity Securities:        
Accumulated other comprehensive income tax expense (benefit) (838)      
Debt securities | Available-for-sale debt securities        
Available-for-sale Equity Securities:        
Shareholders’ equity $ (1,402) $ (1,299) $ 2,405 $ 16