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Fair Value (Schedule of Fair Value Measurements, Assets, Using Significant Unobservable Inputs) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period $ 6,069 $ 6,568 $ 7,564 $ 6,980
Recorded in Revenue, Assets 9 48 18 166
Recorded in Other Comprehensive Income, Assets 4 8 (1) 40
Purchases, Assets 66 812 155 1,242
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 (7) (36)
Settlements, Assets (340) (605) (705) (1,137)
Transfers into Level 3, Assets 0 139 0 139
Transfers out of Level 3, Assets (52) (76) (1,268) (500)
Fair value as of end of period 5,756 6,894 5,756 6,894
Change in Unrealized Gains (Losses) Related to Financial Instruments Held as of period end (4) 34 (7) 56
Derivative instruments, assets
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period 6 172 19 113
Recorded in Revenue, Assets (6) 31 (15) 134
Recorded in Other Comprehensive Income, Assets 0 0 0 0
Purchases, Assets 11 12 15 32
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 0 0
Settlements, Assets (1) (94) (9) (158)
Transfers into Level 3, Assets 0 0 0 0
Transfers out of Level 3, Assets 0 0 0 0
Fair value as of end of period 10 121 10 121
Change in Unrealized Gains (Losses) Related to Financial Instruments Held as of period end (4) 34 (7) 56
Foreign exchange contracts
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period 6 172 19 113
Recorded in Revenue, Assets (6) 31 (15) 134
Recorded in Other Comprehensive Income, Assets 0 0 0 0
Purchases, Assets 11 12 15 32
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 0 0
Settlements, Assets (1) (94) (9) (158)
Transfers into Level 3, Assets 0 0 0 0
Transfers out of Level 3, Assets 0 0 0 0
Fair value as of end of period 10 121 10 121
Change in Unrealized Gains (Losses) Related to Financial Instruments Held as of period end (4) 34 (7) 56
Categories of investments, marketable securities, available-for-sale securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period 6,063 6,396 7,545 6,867
Recorded in Revenue, Assets 15 17 33 32
Recorded in Other Comprehensive Income, Assets 4 8 (1) 40
Purchases, Assets 55 800 140 1,210
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 (7) (36)
Settlements, Assets (339) (511) (696) (979)
Transfers into Level 3, Assets 0 139 0 139
Transfers out of Level 3, Assets (52) (76) (1,268) (500)
Fair value as of end of period 5,746 6,773 5,746 6,773
Categories of investments, marketable securities, available-for-sale securities | US Treasury and federal agencies, mortgage-backed securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period 100 798 716 825
Recorded in Revenue, Assets 0 0 0 0
Recorded in Other Comprehensive Income, Assets 0 0 0 1
Purchases, Assets 0 92 0 92
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 0 0
Settlements, Assets (4) (26) (9) (54)
Transfers into Level 3, Assets 0 0 0 0
Transfers out of Level 3, Assets 0 0 (611) 0
Fair value as of end of period 96 864 96 864
Categories of investments, marketable securities, available-for-sale securities | Total asset-backed securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period 4,637 4,357 4,979 4,649
Recorded in Revenue, Assets 14 16 30 29
Recorded in Other Comprehensive Income, Assets 1 11 (3) 38
Purchases, Assets 0 385 6 565
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 0 (36)
Settlements, Assets (269) (441) (550) (818)
Transfers into Level 3, Assets 0 0 0 0
Transfers out of Level 3, Assets 0 (76) (79) (175)
Fair value as of end of period 4,383 4,252 4,383 4,252
Categories of investments, marketable securities, available-for-sale securities | Asset-backed securities, student loans
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period 333 461 423 588
Recorded in Revenue, Assets 1 1 1 1
Recorded in Other Comprehensive Income, Assets 2 2 3 8
Purchases, Assets 0 0 0 0
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 0 (26)
Settlements, Assets (14) (8) (26) (16)
Transfers into Level 3, Assets 0 0 0 0
Transfers out of Level 3, Assets 0 (76) (79) (175)
Fair value as of end of period 322 380 322 380
Categories of investments, marketable securities, available-for-sale securities | Asset-backed securities, credit cards
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period   24 24 67
Recorded in Revenue, Assets   0 0 0
Recorded in Other Comprehensive Income, Assets   0 0 0
Purchases, Assets   0 0 0
Issuances, Assets   0 0 0
Sales, Assets   0 0 0
Settlements, Assets   0 (24) (43)
Transfers into Level 3, Assets   0 0 0
Transfers out of Level 3, Assets   0 0 0
Fair value as of end of period 0 24 0 24
Categories of investments, marketable securities, available-for-sale securities | Asset-backed securities, other
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period 4,304 3,872 4,532 3,994
Recorded in Revenue, Assets 13 15 29 28
Recorded in Other Comprehensive Income, Assets (1) 9 (6) 30
Purchases, Assets 0 385 6 565
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 0 (10)
Settlements, Assets (255) (433) (500) (759)
Transfers into Level 3, Assets 0 0 0 0
Transfers out of Level 3, Assets 0 0 0 0
Fair value as of end of period 4,061 3,848 4,061 3,848
Categories of investments, marketable securities, available-for-sale securities | Total non-U.S. debt securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period 1,074 1,077 1,637 1,219
Recorded in Revenue, Assets 1 1 3 3
Recorded in Other Comprehensive Income, Assets 2 (2) 2 2
Purchases, Assets 55 183 54 413
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 (1) 0
Settlements, Assets (59) (33) (123) (86)
Transfers into Level 3, Assets 0 139 0 139
Transfers out of Level 3, Assets (52) 0 (551) (325)
Fair value as of end of period 1,021 1,365 1,021 1,365
Categories of investments, marketable securities, available-for-sale securities | Non-U.S. debt securities, mortgage-backed securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period   331 375 555
Recorded in Revenue, Assets   0 0 0
Recorded in Other Comprehensive Income, Assets   (1) 0 0
Purchases, Assets   0 0 0
Issuances, Assets   0 0 0
Sales, Assets   0 0 0
Settlements, Assets   (2) 0 (19)
Transfers into Level 3, Assets   0 0 0
Transfers out of Level 3, Assets   0 (375) (208)
Fair value as of end of period 0 328 0 328
Categories of investments, marketable securities, available-for-sale securities | Non-U.S. debt securities, asset-backed securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period 612 470 798 524
Recorded in Revenue, Assets 1 1 3 3
Recorded in Other Comprehensive Income, Assets 1 (2) 1 1
Purchases, Assets 0 183 0 234
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 0 0
Settlements, Assets (56) (35) (120) (68)
Transfers into Level 3, Assets 0 139 0 139
Transfers out of Level 3, Assets (52) 0 (176) (77)
Fair value as of end of period 506 756 506 756
Categories of investments, marketable securities, available-for-sale securities | Non-U.S. debt securities, other
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period 462 276 464 140
Recorded in Revenue, Assets 0 0 0 0
Recorded in Other Comprehensive Income, Assets 1 1 1 1
Purchases, Assets 55   54 179
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 (1) 0
Settlements, Assets (3) 4 (3) 1
Transfers into Level 3, Assets 0 0 0 0
Transfers out of Level 3, Assets 0 0 0 (40)
Fair value as of end of period 515 281 515 281
Categories of investments, marketable securities, available-for-sale securities | State and political subdivisions
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period 42 47 43 48
Recorded in Revenue, Assets 0 0 0 0
Recorded in Other Comprehensive Income, Assets 0 (1) (1) (1)
Purchases, Assets 0 0 0 0
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 0 0
Settlements, Assets (1) (1) (1) (2)
Transfers into Level 3, Assets 0 0 0 0
Transfers out of Level 3, Assets 0 0 0 0
Fair value as of end of period 41 45 41 45
Categories of investments, marketable securities, available-for-sale securities | Collateralized mortgage obligations
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period 202 108 162 117
Recorded in Revenue, Assets 0 0 0 0
Recorded in Other Comprehensive Income, Assets 0 0 0 0
Purchases, Assets 0 140 80 140
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 (6) 0
Settlements, Assets (6) (10) (13) (19)
Transfers into Level 3, Assets 0 0 0 0
Transfers out of Level 3, Assets 0 0 (27) 0
Fair value as of end of period 196 238 196 238
Categories of investments, marketable securities, available-for-sale securities | Other U.S. debt securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value as of beginning of period 8 9 8 9
Recorded in Revenue, Assets 0 0 0 0
Recorded in Other Comprehensive Income, Assets 1 0 1 0
Purchases, Assets 0 0 0 0
Issuances, Assets 0 0 0 0
Sales, Assets 0 0 0 0
Settlements, Assets 0 0 0 0
Transfers into Level 3, Assets 0 0 0 0
Transfers out of Level 3, Assets 0 0 0 0
Fair value as of end of period $ 9 $ 9 $ 9 $ 9