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Securities - Amortized Cost, Fair Value, by Contract Maturity (Details 5) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Available-for-sale Securities, Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost $ 24,160  
Due after 1 year through 5 years, amortized cost 56,194  
Due after 5 years through 10 years, amortized cost 57,032  
Due after 10 years, amortized cost 187,992  
Available-for-sale securities, maturities, amortized cost, total 325,378 359,892
Available-for-sale Securities, Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 24,186  
Due after 1 year through 5 years, fair value 57,199  
Due after 5 years through 10 years, fair value 58,003  
Due after 10 years, fair value 190,589  
Available-for-sale Securities 329,977 371,145
Available For Sale Securities, Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 1.91%  
Due after 1 year through 5 years, average yield 1.93%  
Due after 5 years through 10 years, average yield 1.87%  
Due after 10 years, average yield 3.20%  
Available-for-sale securities, maturities, average yield, total 2.65%  
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 3  
Due after 5 years through 10 years, amortized cost 1  
Due after 10 years, amortized cost 24,022  
Held-to-maturity securities, maturities, amortized cost, total 24,026 7
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 4  
Due after 5 years through 10 years, fair value 1  
Due after 10 years, fair value 23,726  
Held-to-maturity Securities, Fair Value 23,731 8
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 6.86%  
Due after 5 years through 10 years, average yield 6.48%  
Due after 10 years, average yield 3.53%  
Held-to-maturity securities, maturities, average yield, total 3.53%  
Supplemental information    
US government agencies and US government sponsored enterprises residential mortgage-backed securities estimated duration 5 years  
US government agencies and US government sponsored enterprises residential collateralized mortgage obligations estimated duration 2 years  
Non-agency residential collateralized mortgage obligations estimated duration 3 years  
Minimum [Member]
   
Supplemental information    
Due period of mortgage-backed securities and collateralized mortgage obligations 10 years  
Debt securities [Member]
   
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost 24,160  
Due after 1 year through 5 years, amortized cost 56,194  
Due after 5 years through 10 years, amortized cost 57,032  
Due after 10 years, amortized cost 184,867  
Available-for-sale securities, debt maturities, amortized cost total 322,253  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 24,186  
Due after 1 year through 5 years, fair value 57,199  
Due after 5 years through 10 years, fair value 58,003  
Due after 10 years, fair value 187,447  
Available-for-sale, debt maturities, fair value, total 326,835  
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 1.91%  
Due after 1 year through 5 years, average yield 1.93%  
Due after 5 years through 10 years, average yield 1.87%  
Due after 10 years, average yield 3.25%  
Available-for-sale, debt maturities, average yield, total 2.67%  
Available-for-sale Securities, Maturities, Single Maturity Date, Amortized Cost Basis:    
Available-for-sale securities, maturities, amortized cost, total 322,253 357,142
Available-for-sale Securities, Maturities, Single Maturity Date, Fair Value:    
Available-for-sale Securities 326,835 368,374
Mortgage-backed securities [Member]
   
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost 209  
Due after 1 year through 5 years, amortized cost 13,689  
Due after 5 years through 10 years, amortized cost 8,239  
Due after 10 years, amortized cost 131,282  
Available-for-sale securities, debt maturities, amortized cost total 153,419  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 210  
Due after 1 year through 5 years, fair value 14,117  
Due after 5 years through 10 years, fair value 8,489  
Due after 10 years, fair value 133,893  
Available-for-sale, debt maturities, fair value, total 156,709  
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 2.17%  
Due after 1 year through 5 years, average yield 2.10%  
Due after 5 years through 10 years, average yield 2.83%  
Due after 10 years, average yield 2.93%  
Available-for-sale, debt maturities, average yield, total 2.85%  
Available-for-sale Securities, Maturities, Single Maturity Date, Amortized Cost Basis:    
Available-for-sale securities, maturities, amortized cost, total 153,419 178,997
Available-for-sale Securities, Maturities, Single Maturity Date, Fair Value:    
Available-for-sale Securities 156,709 186,230
U.S. Treasury and government agencies [Member]
   
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost 8,781  
Due after 1 year through 5 years, amortized cost 10,246  
Due after 5 years through 10 years, amortized cost 1,425  
Due after 10 years, amortized cost 858  
Available-for-sale securities, debt maturities, amortized cost total 21,310  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 8,792  
Due after 1 year through 5 years, fair value 10,257  
Due after 5 years through 10 years, fair value 1,425  
Due after 10 years, fair value 915  
Available-for-sale, debt maturities, fair value, total 21,389  
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 0.36%  
Due after 1 year through 5 years, average yield 0.39%  
Due after 5 years through 10 years, average yield 0.34%  
Due after 10 years, average yield 0.59%  
Available-for-sale, debt maturities, average yield, total 0.38%  
Available-for-sale Securities, Maturities, Single Maturity Date, Amortized Cost Basis:    
Available-for-sale securities, maturities, amortized cost, total 21,310 12,022
Available-for-sale Securities, Maturities, Single Maturity Date, Fair Value:    
Available-for-sale Securities 21,389 12,130
Obligations of U.S. states and municipalities [Member]
   
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost 57  
Due after 1 year through 5 years, amortized cost 479  
Due after 5 years through 10 years, amortized cost 1,644  
Due after 10 years, amortized cost 27,561  
Available-for-sale securities, debt maturities, amortized cost total 29,741  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 58  
Due after 1 year through 5 years, fair value 505  
Due after 5 years through 10 years, fair value 1,664  
Due after 10 years, fair value 27,234  
Available-for-sale, debt maturities, fair value, total 29,461  
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 3.12%  
Due after 1 year through 5 years, average yield 4.91%  
Due after 5 years through 10 years, average yield 4.27%  
Due after 10 years, average yield 6.19%  
Available-for-sale, debt maturities, average yield, total 6.06%  
Available-for-sale Securities, Maturities, Single Maturity Date, Amortized Cost Basis:    
Available-for-sale securities, maturities, amortized cost, total 29,741 19,876
Available-for-sale Securities, Maturities, Single Maturity Date, Fair Value:    
Available-for-sale Securities 29,461 21,711
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Held-to-maturity securities, maturities, amortized cost, total 920  
Certificates of deposit [Member]
   
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost 990  
Due after 1 year through 5 years, amortized cost 51  
Due after 5 years through 10 years, amortized cost 0  
Due after 10 years, amortized cost 0  
Available-for-sale securities, debt maturities, amortized cost total 1,041  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 988  
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 1,041  
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 6.37%  
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 6.22%  
Available-for-sale Securities, Maturities, Single Maturity Date, Amortized Cost Basis:    
Available-for-sale securities, maturities, amortized cost, total 1,041 2,781
Available-for-sale Securities, Maturities, Single Maturity Date, Fair Value:    
Available-for-sale Securities 1,041 2,783
Non-U.S. government debt securities [Member]
   
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost 11,210  
Due after 1 year through 5 years, amortized cost 16,999  
Due after 5 years through 10 years, amortized cost 24,735  
Due after 10 years, amortized cost 2,563  
Available-for-sale securities, debt maturities, amortized cost total 55,507  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 11,223  
Due after 1 year through 5 years, fair value 17,191  
Due after 5 years through 10 years, fair value 25,166  
Due after 10 years, fair value 2,668  
Available-for-sale, debt maturities, fair value, total 56,248  
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 2.72%  
Due after 1 year through 5 years, average yield 2.26%  
Due after 5 years through 10 years, average yield 1.39%  
Due after 10 years, average yield 1.64%  
Available-for-sale, debt maturities, average yield, total 1.94%  
Available-for-sale Securities, Maturities, Single Maturity Date, Amortized Cost Basis:    
Available-for-sale securities, maturities, amortized cost, total 55,507 65,168
Available-for-sale Securities, Maturities, Single Maturity Date, Fair Value:    
Available-for-sale Securities 56,248 66,044
Corporate debt securities [Member]
   
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost 2,871  
Due after 1 year through 5 years, amortized cost 12,318  
Due after 5 years through 10 years, amortized cost 5,854  
Due after 10 years, amortized cost 0  
Available-for-sale securities, debt maturities, amortized cost total 21,043  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 2,873  
Due after 1 year through 5 years, fair value 12,638  
Due after 5 years through 10 years, fair value 6,001  
Due after 10 years, fair value 0  
Available-for-sale, debt maturities, fair value, total 21,512  
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 1.94%  
Due after 1 year through 5 years, average yield 2.41%  
Due after 5 years through 10 years, average yield 2.60%  
Due after 10 years, average yield 0.00%  
Available-for-sale, debt maturities, average yield, total 2.40%  
Available-for-sale Securities, Maturities, Single Maturity Date, Amortized Cost Basis:    
Available-for-sale securities, maturities, amortized cost, total 21,043 37,999
Available-for-sale Securities, Maturities, Single Maturity Date, Fair Value:    
Available-for-sale Securities 21,512 38,609
Asset-backed securities [Member]
   
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis:    
Due in 1 year or less, amortized cost 42  
Due after 1 year through 5 years, amortized cost 2,412  
Due after 5 years through 10 years, amortized cost 15,135  
Due after 10 years, amortized cost 22,603  
Available-for-sale securities, debt maturities, amortized cost total 40,192  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value:    
Due in 1 year or less, fair value 42  
Due after 1 year through 5 years, fair value 2,438  
Due after 5 years through 10 years, fair value 15,258  
Due after 10 years, fair value 22,737  
Available-for-sale, debt maturities, fair value, total 40,475  
Available For Sale Securities, Debt Maturities, Single Maturity Date, Average Yield:    
Due in 1 year or less, average yield 2.17%  
Due after 1 year through 5 years, average yield 1.98%  
Due after 5 years through 10 years, average yield 1.74%  
Due after 10 years, average yield 1.80%  
Available-for-sale, debt maturities, average yield, total 1.79%  
Equity securities [Member]
   
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 3,125  
Equity maturities, amortized cost, total 3,125  
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 3,142  
Available-for-sale securities, equity maturities, fair value, total 3,142  
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:    
Available-for-sale securities, maturities, amortized cost, total 3,125 2,750
Available-for-sale Securities, Maturities, Single Maturity Date, Fair Value:    
Available-for-sale Securities $ 3,142 $ 2,771