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Financial Instruments - Derivatives, Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivative Instruments, Gain (Loss)    
Gain (loss) recognized in earnings on derivatives $ (222) $ (32)
Gain (loss) recognized in earnings attributable to risk being hedged 182 42
Gains (losses) excluded from the assessment of hedge effectiveness for fair value hedges
Gains (losses) associated with underlying exposure that did not occur or was not expected to occur for cash flow hedges
Cash flow hedges and net investment hedges    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Recognized in OCI (143) (315)
Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI 54 98
Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Amounts Excluded from Effectiveness Testing 12 20
Foreign exchange contracts | Derivative instruments in cash flow hedges    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Recognized in OCI 61 (33)
Foreign exchange contracts | Instruments in net investment hedges    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Recognized in OCI (204) (282)
Cost of Financing | Interest rate contracts | Derivative instruments in fair value hedges    
Derivative Instruments, Gain (Loss)    
Gain (loss) recognized in earnings on derivatives (80) (1)
Gain (loss) recognized in earnings attributable to risk being hedged 96 23
Cost of Financing | Foreign exchange contracts | Instruments in net investment hedges    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Amounts Excluded from Effectiveness Testing 7  
Interest Expense | Interest rate contracts | Derivative instruments in fair value hedges    
Derivative Instruments, Gain (Loss)    
Gain (loss) recognized in earnings on derivatives (72) (1)
Gain (loss) recognized in earnings attributable to risk being hedged 87 20
Interest Expense | Interest rate contracts | Derivative instruments in cash flow hedges    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI (34) (7)
Interest Expense | Foreign exchange contracts | Instruments in net investment hedges    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Amounts Excluded from Effectiveness Testing 5 19
Other (Income) and Expense | Foreign exchange contracts | Derivative instruments in cash flow hedges    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI 104 65
Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Amounts Excluded from Effectiveness Testing   1
Other (Income) and Expense | Foreign exchange contracts | Not designated as hedging instruments - economic hedges    
Derivative Instruments, Gain (Loss)    
Gain (loss) recognized in earnings on derivatives (55) (76)
Cost of Sales | Foreign exchange contracts | Derivative instruments in cash flow hedges    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI (17) 11
Cost of Services | Foreign exchange contracts | Derivative instruments in cash flow hedges    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI 19 8
SG&A Expense | Foreign exchange contracts | Derivative instruments in cash flow hedges    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI (18) 20
SG&A Expense | Equity contracts | Not designated as hedging instruments - economic hedges    
Derivative Instruments, Gain (Loss)    
Gain (loss) recognized in earnings on derivatives $ (14) $ 46