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Financial Instruments - Derivatives, Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Assets $ 940 $ 942
Fair value of total derivative instruments, Liabilities 352 415
Short-term debt 5,977 6,987
Long-term debt (excluding current portion) 40,410 39,837
Fair value of total derivative liabilities and debt 7,044 6,886
Designated as hedging instruments    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Assets 920 870
Fair value of total derivative instruments, Liabilities 307 355
Designated as hedging instruments | Instruments in net investment hedges    
Fair Values of Derivative Instruments    
Long-term debt (excluding current portion) 6,692 6,471
Total debt designated as hedging instruments 6,692 6,471
Not designated as hedging instruments - economic hedges    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Assets 20 72
Fair value of total derivative instruments, Liabilities 45 60
Prepaid expenses and other current assets | Interest rate contracts | Designated as hedging instruments    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Assets   2
Prepaid expenses and other current assets | Foreign exchange contracts | Designated as hedging instruments    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Assets 98 111
Prepaid expenses and other current assets | Foreign exchange contracts | Not designated as hedging instruments - economic hedges    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Assets 18 61
Prepaid expenses and other current assets | Equity contracts | Not designated as hedging instruments - economic hedges    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Assets 2 12
Investments and sundry assets | Interest rate contracts | Designated as hedging instruments    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Assets 303 459
Investments and sundry assets | Foreign exchange contracts | Designated as hedging instruments    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Assets 519 298
Other accrued expenses and liabilities | Interest rate contracts | Designated as hedging instruments    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Liabilities 5  
Other accrued expenses and liabilities | Foreign exchange contracts | Designated as hedging instruments    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Liabilities 223 318
Other accrued expenses and liabilities | Foreign exchange contracts | Not designated as hedging instruments - economic hedges    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Liabilities 15 57
Other accrued expenses and liabilities | Equity contracts | Not designated as hedging instruments - economic hedges    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Liabilities 30 3
Other liabilities | Interest rate contracts | Designated as hedging instruments    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Liabilities 73 34
Other liabilities | Foreign exchange contracts | Designated as hedging instruments    
Fair Values of Derivative Instruments    
Fair value of total derivative instruments, Liabilities $ 6 $ 3