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Securities - Amortized Cost, Fair Value, by Contract Maturity (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost $ 15,827  
Due after 1 year through 5 years, amortized cost 34,430  
Due after 5 years through 10 years, amortized cost 58,963  
Due after 10 years, amortized cost 148,696  
Amortized cost 257,916 $ 288,466
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 15,895  
Due after 1 year through 5 years, fair value 35,157  
Due after 5 years through 10 years, fair value 59,868  
Due after 10 years, fair value 152,560  
Available-for-sale, debt maturities, fair value, total $ 263,480 296,222
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 2.77%  
Due after 1 year through 5 years, average yield 1.95%  
Due after 5 years through 10 years, average yield 1.54%  
Due after 10 years, average yield 3.51%  
Available-for-sale, debt maturities, average yield, total 2.80%  
Available-for-sale Securities, Equity Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost $ 0  
Due after 1 year through 5 years, amortized cost 0  
Due after 5 years through 10 years, amortized cost 0  
Due after 10 years, amortized cost 2,704  
Equity maturities, amortized cost, total 2,704  
Available-for-sale Securities, Equity Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 0  
Due after 1 year through 5 years, fair value 0  
Due after 5 years through 10 years, fair value 0  
Due after 10 years, fair value 2,721  
Available-for-sale securities, equity maturities, fair value, total $ 2,721  
Available For Sale Securities, Equity Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 0.00%  
Due after 1 year through 5 years, average yield 0.00%  
Due after 5 years through 10 years, average yield 0.00%  
Due after 10 years, average yield 0.20%  
Available-for-sale securities, equity maturities, average yield, total 0.20%  
Available-for-sale Securities, Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost $ 15,827  
Due after 1 year through 5 years, amortized cost 34,430  
Due after 5 years through 10 years, amortized cost 58,963  
Due after 10 years, amortized cost 151,400  
Amortized cost 260,620 290,979
Available-for-sale Securities, Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 15,895  
Due after 1 year through 5 years, fair value 35,157  
Due after 5 years through 10 years, fair value 59,868  
Due after 10 years, fair value 155,281  
Fair value $ 266,201 298,752
Available For Sale Securities, Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 2.77%  
Due after 1 year through 5 years, average yield 1.95%  
Due after 5 years through 10 years, average yield 1.54%  
Due after 10 years, average yield 3.45%  
Available-for-sale securities, maturities, average yield, total 2.78%  
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost $ 0  
Due after 1 year through 5 years, amortized cost 53  
Due after 5 years through 10 years, amortized cost 643  
Due after 10 years, amortized cost 50,898  
Amortized cost 51,594 49,252
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 0  
Due after 1 year through 5 years, fair value 52  
Due after 5 years through 10 years, fair value 666  
Due after 10 years, fair value 51,979  
Held-to-maturity Securities, Fair Value $ 52,697 51,154
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Average Yield [Abstract]    
Due in 1 year or less, average yield 0.00%  
Due after 1 year through 5 years, average yield 4.35%  
Due after 5 years through 10 years, average yield 4.86%  
Due after 10 years, average yield 3.96%  
Held-to-maturity securities, maturities, average yield, total 3.97%  
Supplemental information    
US government agencies and US government sponsored enterprises residential mortgage-backed securities estimated duration 6 years  
US government agencies and US government sponsored enterprises residential collateralized mortgage obligations estimated duration 3 years  
U.S. nonagency residential collateralized mortgage obligations estimated duration 5 years  
Minimum    
Supplemental information    
Due period of mortgage-backed securities and collateralized mortgage obligations 10 years  
Mortgage-backed securities    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost $ 2,132  
Due after 1 year through 5 years, amortized cost 11,625  
Due after 5 years through 10 years, amortized cost 5,621  
Due after 10 years, amortized cost 96,980  
Amortized cost 116,358 133,598
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 2,144  
Due after 1 year through 5 years, fair value 11,864  
Due after 5 years through 10 years, fair value 5,821  
Due after 10 years, fair value 99,266  
Available-for-sale, debt maturities, fair value, total $ 119,095 137,322
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 1.47%  
Due after 1 year through 5 years, average yield 1.76%  
Due after 5 years through 10 years, average yield 3.21%  
Due after 10 years, average yield 3.06%  
Available-for-sale, debt maturities, average yield, total 2.91%  
U.S. Treasury and government agencies    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost $ 600  
Due after 1 year through 5 years, amortized cost 0  
Due after 5 years through 10 years, amortized cost 9,937  
Due after 10 years, amortized cost 1,063  
Amortized cost 11,600 13,603
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 602  
Due after 1 year through 5 years, fair value 0  
Due after 5 years through 10 years, fair value 9,914  
Due after 10 years, fair value 1,074  
Available-for-sale, debt maturities, fair value, total $ 11,590 13,645
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 1.53%  
Due after 1 year through 5 years, average yield 0.00%  
Due after 5 years through 10 years, average yield 0.19%  
Due after 10 years, average yield 0.41%  
Available-for-sale, debt maturities, average yield, total 0.28%  
Obligations of U.S. states and municipalities    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost $ 159  
Due after 1 year through 5 years, amortized cost 743  
Due after 5 years through 10 years, amortized cost 1,297  
Due after 10 years, amortized cost 27,787  
Amortized cost 29,986 27,841
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 164  
Due after 1 year through 5 years, fair value 761  
Due after 5 years through 10 years, fair value 1,360  
Due after 10 years, fair value 29,139  
Available-for-sale, debt maturities, fair value, total $ 31,424 30,068
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 6.33%  
Due after 1 year through 5 years, average yield 3.21%  
Due after 5 years through 10 years, average yield 5.62%  
Due after 10 years, average yield 6.68%  
Available-for-sale, debt maturities, average yield, total 6.54%  
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Amortized cost $ 12,400 10,200
Certificates of deposit    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost 375  
Due after 1 year through 5 years, amortized cost 52  
Due after 5 years through 10 years, amortized cost 0  
Due after 10 years, amortized cost 0  
Amortized cost 427 1,103
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 376  
Due after 1 year through 5 years, fair value 53  
Due after 5 years through 10 years, fair value 0  
Due after 10 years, fair value 0  
Available-for-sale, debt maturities, fair value, total $ 429 1,103
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 5.64%  
Due after 1 year through 5 years, average yield 3.28%  
Due after 5 years through 10 years, average yield 0.00%  
Due after 10 years, average yield 0.00%  
Available-for-sale, debt maturities, average yield, total 5.36%  
Non-U.S. government debt securities    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost $ 8,631  
Due after 1 year through 5 years, amortized cost 13,015  
Due after 5 years through 10 years, amortized cost 17,777  
Due after 10 years, amortized cost 2,414  
Amortized cost 41,837 51,492
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 8,651  
Due after 1 year through 5 years, fair value 13,305  
Due after 5 years through 10 years, fair value 18,297  
Due after 10 years, fair value 2,539  
Available-for-sale, debt maturities, fair value, total $ 42,792 52,743
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 3.28%  
Due after 1 year through 5 years, average yield 1.87%  
Due after 5 years through 10 years, average yield 0.99%  
Due after 10 years, average yield 0.87%  
Available-for-sale, debt maturities, average yield, total 1.73%  
Corporate debt securities    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost $ 3,417  
Due after 1 year through 5 years, amortized cost 8,386  
Due after 5 years through 10 years, amortized cost 3,594  
Due after 10 years, amortized cost 143  
Amortized cost 15,540 18,158
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 3,443  
Due after 1 year through 5 years, fair value 8,560  
Due after 5 years through 10 years, fair value 3,678  
Due after 10 years, fair value 141  
Available-for-sale, debt maturities, fair value, total $ 15,822 $ 18,532
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 2.29%  
Due after 1 year through 5 years, average yield 2.24%  
Due after 5 years through 10 years, average yield 2.63%  
Due after 10 years, average yield 4.46%  
Available-for-sale, debt maturities, average yield, total 2.36%  
Asset-backed securities    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost $ 513  
Due after 1 year through 5 years, amortized cost 609  
Due after 5 years through 10 years, amortized cost 20,737  
Due after 10 years, amortized cost 20,309  
Amortized cost 42,168  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 515  
Due after 1 year through 5 years, fair value 614  
Due after 5 years through 10 years, fair value 20,798  
Due after 10 years, fair value 20,401  
Available-for-sale, debt maturities, fair value, total $ 42,328  
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 0.99%  
Due after 1 year through 5 years, average yield 1.55%  
Due after 5 years through 10 years, average yield 1.75%  
Due after 10 years, average yield 1.77%  
Available-for-sale, debt maturities, average yield, total 1.75%