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, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Available-for-sale debt securities        
Amortized Cost $ 279,812 $ 306,261    
Gross Unrealized Gains 4,616 1,536    
Gross Unrealized Losses (308) (2,024)    
Fair Value 284,120 305,773    
Other debt securities carried at fair value        
Amortized Cost 18,378 16,678    
Gross Unrealized Gains 87 103    
Gross Unrealized Losses (252) (174)    
Fair Value 18,213 16,607    
Total debt securities carried at fair value        
Amortized Cost 298,190 322,939    
Gross Unrealized Gains 4,703 1,639    
Gross Unrealized Losses (560) (2,198)    
Debt securities carried at fair value 302,333 322,380    
Held-to-maturity debt securities, substantially all U.S. agency mortgage-backed securities        
Amortized Cost 97,978 84,625    
Gross Unrealized Gains 1,244 271    
Gross Unrealized Losses (147) (850)    
Held-to-maturity, fair value 99,075 84,046    
Total debt securities        
Amortized Cost 396,168 407,564    
Gross Unrealized Gains 5,947 1,910    
Gross Unrealized Losses (707) (3,048)    
Fair Value 401,408 406,426    
Available-for-sale marketable equity securities        
Net unrealized gain on AFS debt securities in AOCI 262,776 256,205 $ 250,188 $ 243,471
Nonperforming Financing Receivable        
Available-for-sale debt securities        
Fair Value 131 188    
FNMA Insured Loans        
Total debt securities carried at fair value        
Amortized Cost 144,100 146,200    
Debt securities carried at fair value 146,400 145,500    
FHLMC Insured Loans        
Total debt securities carried at fair value        
Amortized Cost 53,700 53,400    
Debt securities carried at fair value 54,600 53,200    
Securities financing agreements        
Available-for-sale marketable equity securities        
Amortized Cost 326 326    
Gross Unrealized Gains 56 99    
Gross Unrealized Losses (11) 0    
Fair Value 371 425    
Agency        
Available-for-sale debt securities        
Amortized Cost 204,557 229,847    
Gross Unrealized Gains 3,257 788    
Gross Unrealized Losses (78) (1,688)    
Fair Value 207,736 228,947    
Total debt securities carried at fair value        
Debt securities carried at fair value 207,736      
Agency-collateralized mortgage obligations        
Available-for-sale debt securities        
Amortized Cost 10,294 10,930    
Gross Unrealized Gains 277 126    
Gross Unrealized Losses (13) (71)    
Fair Value 10,558 10,985    
Total debt securities carried at fair value        
Debt securities carried at fair value 10,564      
Commercial        
Available-for-sale debt securities        
Amortized Cost 9,989 7,176    
Gross Unrealized Gains 245 50    
Gross Unrealized Losses (1) (61)    
Fair Value 10,233 7,165    
Total debt securities carried at fair value        
Debt securities carried at fair value 10,233      
Non-agency residential        
Available-for-sale debt securities        
Amortized Cost 2,104 3,031    
Gross Unrealized Gains 202 218    
Gross Unrealized Losses (77) (70)    
Fair Value 2,229 $ 3,179    
Total debt securities carried at fair value        
Debt securities carried at fair value $ 5,552      
Non-agency residential | Prime        
Available-for-sale marketable equity securities        
Available-for-sale securities, percent held by rating 57.00% 71.00%    
Non-agency residential | Alt-A Loan        
Available-for-sale marketable equity securities        
Available-for-sale securities, percent held by rating 23.00% 15.00%    
Non-agency residential | Subprime        
Available-for-sale marketable equity securities        
Available-for-sale securities, percent held by rating 20.00% 14.00%    
Total mortgage-backed securities        
Available-for-sale debt securities        
Amortized Cost $ 226,944 $ 250,984    
Gross Unrealized Gains 3,981 1,182    
Gross Unrealized Losses (169) (1,890)    
Fair Value 230,756 250,276    
Total debt securities carried at fair value        
Debt securities carried at fair value 234,085      
U.S. Treasury and agency securities        
Available-for-sale debt securities        
Amortized Cost 21,732 25,075    
Gross Unrealized Gains 484 211    
Gross Unrealized Losses 0 (9)    
Fair Value 22,216 25,277    
Total debt securities carried at fair value        
Debt securities carried at fair value 22,216      
Non-U.S. securities        
Available-for-sale debt securities        
Amortized Cost 6,059 5,743    
Gross Unrealized Gains 26 27    
Gross Unrealized Losses (5) (3)    
Fair Value 6,080 5,767    
Total debt securities carried at fair value        
Debt securities carried at fair value 20,708      
Other taxable securities, substantially all asset-backed securities        
Available-for-sale debt securities        
Amortized Cost 10,526 10,481    
Gross Unrealized Gains 53 53    
Gross Unrealized Losses (99) (89)    
Fair Value 10,480 10,445    
Total debt securities carried at fair value        
Debt securities carried at fair value 10,736      
Total taxable securities        
Available-for-sale debt securities        
Amortized Cost 265,261 292,283    
Gross Unrealized Gains 4,544 1,473    
Gross Unrealized Losses (273) (1,991)    
Fair Value 269,532 291,765    
Total debt securities carried at fair value        
Debt securities carried at fair value 287,745      
Tax-exempt securities        
Available-for-sale debt securities        
Amortized Cost 14,551 13,978    
Gross Unrealized Gains 72 63    
Gross Unrealized Losses (35) (33)    
Fair Value 14,588 14,008    
Total debt securities carried at fair value        
Debt securities carried at fair value 14,588      
Debt securities        
Total debt securities carried at fair value        
Debt securities carried at fair value 302,333      
Available-for-sale marketable equity securities        
Accumulated other comprehensive income tax expense 1,700      
Debt securities | Available-for-sale debt securities        
Available-for-sale marketable equity securities        
Net unrealized gain on AFS debt securities in AOCI $ 2,624 $ (300) $ 2,660 $ 1,343