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
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Available-for-sale debt securities        
Amortized Cost $ 295,161 $ 282,108    
Gross Unrealized Gains 3,277 3,001    
Gross Unrealized Losses (752) (835)    
Fair Value 297,686 284,274    
Available-for-sale marketable equity securities        
Net unrealized gain on AFS debt securities in AOCI 255,905 243,471 $ 238,681 $ 232,685
Other debt securities carried at fair value        
Amortized Cost 27,457 36,524    
Gross Unrealized Gains 161 261    
Gross Unrealized Losses (226) (364)    
Fair Value 27,392 36,421    
Total debt securities carried at fair value        
Amortized Cost 322,618 318,632    
Gross Unrealized Gains 3,438 3,262    
Gross Unrealized Losses (978) (1,199)    
Debt securities carried at fair value 325,078 320,695    
Held-to-maturity debt securities, substantially all U.S. agency mortgage-backed securities        
Amortized Cost 66,573 59,766    
Gross Unrealized Gains 495 486    
Gross Unrealized Losses (588) (611)    
Held-to-maturity, fair value 66,480 59,641    
Total debt securities        
Amortized Cost 389,191 378,398    
Gross Unrealized Gains 3,933 3,748    
Gross Unrealized Losses (1,566) (1,810)    
Fair Value 391,558 380,336    
Securities financing agreements        
Available-for-sale marketable equity securities        
Amortized Cost 331 336    
Gross Unrealized Gains 24 27    
Gross Unrealized Losses 0 0    
Fair Value 355 363    
Nonperforming Financing Receivable        
Available-for-sale debt securities        
Fair Value 194 161    
Agency        
Available-for-sale debt securities        
Amortized Cost 207,057 163,592    
Gross Unrealized Gains 1,854 2,040    
Gross Unrealized Losses (592) (593)    
Fair Value 208,319 165,039    
Total debt securities carried at fair value        
Debt securities carried at fair value 216,263      
Agency-collateralized mortgage obligations        
Available-for-sale debt securities        
Amortized Cost 11,836 14,175    
Gross Unrealized Gains 263 152    
Gross Unrealized Losses (24) (79)    
Fair Value 12,075 14,248    
Total debt securities carried at fair value        
Debt securities carried at fair value 12,082      
Non-agency residential        
Available-for-sale debt securities        
Amortized Cost 3,383 4,244    
Gross Unrealized Gains 255 287    
Gross Unrealized Losses (56) (77)    
Fair Value 3,582 $ 4,454    
Total debt securities carried at fair value        
Debt securities carried at fair value $ 7,217      
Non-agency residential | Prime        
Available-for-sale marketable equity securities        
Available-for-sale securities, percent held by rating 74.00% 76.00%    
Non-agency residential | Alt-A Loan        
Available-for-sale marketable equity securities        
Available-for-sale securities, percent held by rating 14.00% 14.00%    
Non-agency residential | Subprime        
Available-for-sale marketable equity securities        
Available-for-sale securities, percent held by rating 12.00% 10.00%    
Commercial        
Available-for-sale debt securities        
Amortized Cost $ 5,422 $ 3,931    
Gross Unrealized Gains 115 69    
Gross Unrealized Losses (7)      
Fair Value 5,530 4,000    
Total debt securities carried at fair value        
Debt securities carried at fair value 5,530      
Total mortgage-backed securities        
Available-for-sale debt securities        
Amortized Cost 227,698 185,942    
Gross Unrealized Gains 2,487 2,548    
Gross Unrealized Losses (679) (749)    
Fair Value 229,506 187,741    
Total debt securities carried at fair value        
Debt securities carried at fair value 241,092      
U.S. Treasury and agency securities        
Available-for-sale debt securities        
Amortized Cost 39,422 69,267    
Gross Unrealized Gains 711 360    
Gross Unrealized Losses (2) (32)    
Fair Value 40,131 69,595    
Total debt securities carried at fair value        
Debt securities carried at fair value 40,131      
Non-U.S. securities        
Available-for-sale debt securities        
Amortized Cost 6,356 6,208    
Gross Unrealized Gains 26 33    
Gross Unrealized Losses (7) (11)    
Fair Value 6,375 6,230    
Total debt securities carried at fair value        
Debt securities carried at fair value 21,904      
Corporate/Agency bonds        
Available-for-sale debt securities        
Amortized Cost 231 361    
Gross Unrealized Gains 4 9    
Gross Unrealized Losses (1) (2)    
Fair Value 234 368    
Total debt securities carried at fair value        
Debt securities carried at fair value 234      
Other taxable securities, substantially all asset-backed securities        
Available-for-sale debt securities        
Amortized Cost 9,769 10,774    
Gross Unrealized Gains 18 39    
Gross Unrealized Losses (37) (22)    
Fair Value 9,750 10,791    
Total debt securities carried at fair value        
Debt securities carried at fair value 10,027      
Total taxable securities        
Available-for-sale debt securities        
Amortized Cost 283,476 272,552    
Gross Unrealized Gains 3,246 2,989    
Gross Unrealized Losses (726) (816)    
Fair Value 285,996 274,725    
Total debt securities carried at fair value        
Debt securities carried at fair value 313,388      
Tax-exempt securities        
Available-for-sale debt securities        
Amortized Cost 11,685 9,556    
Gross Unrealized Gains 31 12    
Gross Unrealized Losses (26) (19)    
Fair Value 11,690 9,549    
Total debt securities carried at fair value        
Debt securities carried at fair value 11,690      
Debt securities        
Available-for-sale marketable equity securities        
Accumulated other comprehensive income tax expense 963      
Total debt securities carried at fair value        
Debt securities carried at fair value 325,078      
Debt securities | Available-for-sale debt securities        
Available-for-sale marketable equity securities        
Net unrealized gain on AFS debt securities in AOCI $ 1,562 $ 1,343 $ (656) $ (3,257)