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Securities - Amortized Cost, Gains and Losses, and Fair Value Available-for-sale (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Available-for-sale Debt Securities:        
Amortized Cost $ 305,750 $ 281,630    
Gross Unrealized Gains 1,813 3,423    
Gross Unrealized Losses (1,790) (779)    
Debt securities carried at fair value 305,773 284,274    
Other Debt Securities, Carried at Fair Value:        
Amortized Cost 16,678 36,543    
Gross Unrealized Gains 103 257    
Gross Unrealized Losses (174) (379)    
Fair Value 16,607 36,421    
Debt securities carried at fair value:        
Amortized Cost 322,428 318,173    
Gross Unrealized Gains 1,916 3,680    
Gross Unrealized Losses (1,964) (1,158)    
Debt securities carried at fair value 322,380 320,695    
Shareholders’ equity 256,176 243,476 $ 232,475 $ 236,962
Held-to-maturity Securities:        
Amortized Cost 84,508 59,757    
Gross Unrealized Gains 330 538    
Gross Unrealized Losses (792) (654)    
Held-to-maturity, fair value 84,046 59,641    
Debt securities:        
Amortized Cost 406,936 377,930    
Gross Unrealized Gains 2,246 4,218    
Gross Unrealized Losses (2,756) (1,812)    
Fair Value 406,426 380,336    
Accumulated other comprehensive income (loss) (5,358) (4,022)    
Nonperforming Financing Receivable        
Available-for-sale Debt Securities:        
Debt securities carried at fair value 188 161    
FNMA        
Debt securities carried at fair value:        
Amortized Cost 145,800 130,300    
Debt securities carried at fair value 145,500 131,400    
FHLMC        
Debt securities carried at fair value:        
Amortized Cost 53,300 28,300    
Debt securities carried at fair value 53,200 28,600    
Other assets        
Available-for-sale Equity Securities:        
Amortized Cost 326 336    
Gross Unrealized Gains 99 27    
Gross Unrealized Losses 0 0    
Fair Value 425 363    
Agency-collateralized mortgage obligations        
Available-for-sale Debt Securities:        
Amortized Cost 10,892 14,170    
Gross Unrealized Gains 148 181    
Gross Unrealized Losses (55) (103)    
Debt securities carried at fair value 10,985 14,248    
Other Debt Securities, Carried at Fair Value:        
Fair Value 7 0    
Debt securities carried at fair value:        
Debt securities carried at fair value 10,992      
Commercial        
Available-for-sale Debt Securities:        
Amortized Cost 7,200 3,932    
Gross Unrealized Gains 30 68    
Gross Unrealized Losses (65) 0    
Debt securities carried at fair value 7,165 4,000    
Debt securities carried at fair value:        
Debt securities carried at fair value 7,165      
Non-agency residential        
Available-for-sale Debt Securities:        
Amortized Cost 3,031 4,244    
Gross Unrealized Gains 219 286    
Gross Unrealized Losses (71) (76)    
Debt securities carried at fair value 3,179 4,454    
Other Debt Securities, Carried at Fair Value:        
Fair Value 3,490 $ 3,745    
Debt securities carried at fair value:        
Debt securities carried at fair value $ 6,669      
Non-agency residential | Prime        
Debt securities:        
Available-for-sale securities, percent held by rating 71.00% 76.00%    
Non-agency residential | Alt-A        
Debt securities:        
Available-for-sale securities, percent held by rating 15.00% 14.00%    
Non-agency residential | Subprime        
Debt securities:        
Available-for-sale securities, percent held by rating 14.00% 10.00%    
Mortgage-backed securities        
Available-for-sale Debt Securities:        
Amortized Cost $ 250,479 $ 185,464    
Gross Unrealized Gains 1,458 2,967    
Gross Unrealized Losses (1,661) (690)    
Debt securities carried at fair value 250,276 187,741    
Other Debt Securities, Carried at Fair Value:        
Fair Value 3,497 19,449    
Debt securities carried at fair value:        
Debt securities carried at fair value 253,773      
U.S. Treasury and agency securities        
Available-for-sale Debt Securities:        
Amortized Cost 25,075 69,268    
Gross Unrealized Gains 211 359    
Gross Unrealized Losses (9) (32)    
Debt securities carried at fair value 25,277 69,595    
Other Debt Securities, Carried at Fair Value:        
Fair Value 0 1,541    
Debt securities carried at fair value:        
Debt securities carried at fair value 25,277      
Non-U.S. securities        
Available-for-sale Debt Securities:        
Amortized Cost 5,743 6,208    
Gross Unrealized Gains 27 37    
Gross Unrealized Losses (3) (15)    
Debt securities carried at fair value 5,767 6,230    
Other Debt Securities, Carried at Fair Value:        
Fair Value 12,843 15,132    
Debt securities carried at fair value:        
Debt securities carried at fair value 18,610      
Corporate/Agency bonds        
Available-for-sale Debt Securities:        
Amortized Cost 243 361    
Gross Unrealized Gains 3 9    
Gross Unrealized Losses (3) (2)    
Debt securities carried at fair value 243 368    
Debt securities carried at fair value:        
Debt securities carried at fair value 243      
Other taxable securities, substantially all asset-backed securities        
Available-for-sale Debt Securities:        
Amortized Cost 10,232 10,773    
Gross Unrealized Gains 51 39    
Gross Unrealized Losses (81) (21)    
Debt securities carried at fair value 10,202 10,791    
Other Debt Securities, Carried at Fair Value:        
Fair Value 267 299    
Debt securities carried at fair value:        
Debt securities carried at fair value 10,469      
Total taxable securities        
Available-for-sale Debt Securities:        
Amortized Cost 291,772 272,074    
Gross Unrealized Gains 1,750 3,411    
Gross Unrealized Losses (1,757) (760)    
Debt securities carried at fair value 291,765 274,725    
Debt securities carried at fair value:        
Debt securities carried at fair value 308,372      
Tax-exempt securities        
Available-for-sale Debt Securities:        
Amortized Cost 13,978 9,556    
Gross Unrealized Gains 63 12    
Gross Unrealized Losses (33) (19)    
Debt securities carried at fair value 14,008 9,549    
Debt securities carried at fair value:        
Debt securities carried at fair value 14,008      
Agency        
Available-for-sale Debt Securities:        
Amortized Cost 229,356 163,118    
Gross Unrealized Gains 1,061 2,432    
Gross Unrealized Losses (1,470) (511)    
Debt securities carried at fair value 228,947 165,039    
Other Debt Securities, Carried at Fair Value:        
Fair Value 0 15,704    
Debt securities carried at fair value:        
Debt securities carried at fair value 228,947      
Debt securities        
Debt securities carried at fair value:        
Debt securities carried at fair value 322,380      
Debt securities:        
Accumulated other comprehensive income tax benefit 7      
Debt securities | Available-for-sale debt securities        
Debt securities carried at fair value:        
Shareholders’ equity $ 16 $ 1,641 $ (2,487) $ 4,537