Annual report pursuant to Section 13 and 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
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Available-for-sale Debt Securities:        
Amortized Cost   $ 305,750    
Amortized Cost $ 296,579      
Gross Unrealized Gains 1,280 1,813    
Gross Unrealized Losses (3,300) (1,790)    
Debt securities carried at fair value   305,773    
Fair Value 294,559      
Less: Available-for-sale securities of business held for sale (619)      
Other Debt Securities, Carried at Fair Value:        
Amortized Cost 19,748 16,678    
Gross Unrealized Gains 121 103    
Gross Unrealized Losses (149) (174)    
Fair Value 19,720 16,607    
Debt securities carried at fair value:        
Amortized Cost 315,708 322,428    
Gross Unrealized Gains 1,401 1,916    
Gross Unrealized Losses 3,449 1,964    
Debt securities carried at fair value 313,660 322,380    
Held-to-maturity Securities:        
Amortized Cost 117,071 84,508    
Gross Unrealized Gains 248 330    
Gross Unrealized Losses (2,034) (792)    
Held-to-maturity, fair value 115,285 84,046    
Debt securities:        
Amortized Cost 432,779 406,936    
Gross Unrealized Gains 1,649 2,246    
Gross Unrealized Losses 5,483 2,756    
Fair Value 428,945 406,426    
Available-for-sale Equity Securities:        
Shareholders’ equity 266,840 256,176 $ 243,476 $ 232,475
Nonperforming Financing Receivable        
Available-for-sale Debt Securities:        
Debt securities carried at fair value 121 188    
FNMA        
Debt securities carried at fair value:        
Amortized Cost 156,400 145,800    
Debt securities carried at fair value 154,400 145,500    
FHLMC        
Debt securities carried at fair value:        
Amortized Cost 48,700 53,300    
Debt securities carried at fair value 48,300 53,200    
Other assets        
Available-for-sale Equity Securities:        
Amortized Cost 325 326    
Gross Unrealized Gains 51 99    
Gross Unrealized Losses (1) 0    
Fair Value 375 425    
Agency        
Available-for-sale Debt Securities:        
Amortized Cost 190,809 229,356    
Gross Unrealized Gains 640 1,061    
Gross Unrealized Losses (1,963) (1,470)    
Debt securities carried at fair value 189,486 228,947    
Debt securities carried at fair value:        
Debt securities carried at fair value 189,486      
Agency-collateralized mortgage obligations        
Available-for-sale Debt Securities:        
Amortized Cost 8,296 10,892    
Gross Unrealized Gains 85 148    
Gross Unrealized Losses (51) (55)    
Debt securities carried at fair value 8,330 10,985    
Other Debt Securities, Carried at Fair Value:        
Fair Value 5 7    
Debt securities carried at fair value:        
Debt securities carried at fair value 8,335      
Commercial        
Available-for-sale Debt Securities:        
Amortized Cost 12,594 7,200    
Gross Unrealized Gains 21 30    
Gross Unrealized Losses (293) (65)    
Debt securities carried at fair value 12,322 7,165    
Debt securities carried at fair value:        
Debt securities carried at fair value 12,322      
Non-agency residential        
Available-for-sale Debt Securities:        
Amortized Cost 1,863 3,031    
Gross Unrealized Gains 181 219    
Gross Unrealized Losses (31) (71)    
Debt securities carried at fair value 2,013 3,179    
Other Debt Securities, Carried at Fair Value:        
Fair Value 3,139 $ 3,490    
Debt securities carried at fair value:        
Debt securities carried at fair value $ 5,152      
Non-agency residential | Prime        
Available-for-sale Equity Securities:        
Available-for-sale securities, percent held by rating 60.00% 71.00%    
Non-agency residential | Alt-A        
Available-for-sale Equity Securities:        
Available-for-sale securities, percent held by rating 19.00% 15.00%    
Non-agency residential | Subprime        
Available-for-sale Equity Securities:        
Available-for-sale securities, percent held by rating 21.00% 14.00%    
Mortgage-backed securities        
Available-for-sale Debt Securities:        
Amortized Cost $ 213,562 $ 250,479    
Gross Unrealized Gains 927 1,458    
Gross Unrealized Losses (2,338) (1,661)    
Debt securities carried at fair value 212,151 250,276    
Other Debt Securities, Carried at Fair Value:        
Fair Value 3,144 3,497    
Debt securities carried at fair value:        
Debt securities carried at fair value 215,295      
U.S. Treasury and agency securities        
Available-for-sale Debt Securities:        
Amortized Cost 48,800 25,075    
Gross Unrealized Gains 204 211    
Gross Unrealized Losses (752) (9)    
Debt securities carried at fair value 48,252 25,277    
Debt securities carried at fair value:        
Debt securities carried at fair value 48,252      
Non-U.S. securities        
Available-for-sale Debt Securities:        
Amortized Cost   5,743    
Amortized Cost 6,372      
Gross Unrealized Gains 13 27    
Gross Unrealized Losses (3) (3)    
Debt securities carried at fair value   5,767    
Fair Value 6,382      
Other Debt Securities, Carried at Fair Value:        
Fair Value 16,336 12,843    
Debt securities carried at fair value:        
Debt securities carried at fair value 22,718      
Other taxable securities, substantially all asset-backed securities        
Available-for-sale Debt Securities:        
Amortized Cost 10,573 10,475    
Gross Unrealized Gains 64 54    
Gross Unrealized Losses (23) (84)    
Debt securities carried at fair value 10,614 10,445    
Other Debt Securities, Carried at Fair Value:        
Fair Value 240 267    
Debt securities carried at fair value:        
Debt securities carried at fair value 10,854      
Total taxable securities        
Available-for-sale Debt Securities:        
Amortized Cost   291,772    
Amortized Cost 279,307      
Gross Unrealized Gains 1,208 1,750    
Gross Unrealized Losses (3,116) (1,757)    
Debt securities carried at fair value   291,765    
Fair Value 277,399      
Debt securities carried at fair value:        
Debt securities carried at fair value 297,119      
Tax-exempt securities        
Available-for-sale Debt Securities:        
Amortized Cost 17,272 13,978    
Gross Unrealized Gains 72 63    
Gross Unrealized Losses (184) (33)    
Debt securities carried at fair value 17,160 14,008    
Debt securities carried at fair value:        
Debt securities carried at fair value 17,160      
Debt securities        
Debt securities carried at fair value:        
Debt securities carried at fair value 314,279      
Available-for-sale Equity Securities:        
Accumulated other comprehensive income tax benefit (721)      
Debt securities | Available-for-sale debt securities        
Available-for-sale Equity Securities:        
Shareholders’ equity $ (1,299) $ 16 $ 1,641 $ (2,487)