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Financial Instruments - Effect of Net Investment Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Loans payable and current portion of long-term debt          
Derivative Instruments, Gain (Loss) [Line Items]          
Carrying Amount of Hedged Liabilities $ 554   $ 554   $ 983
Cumulative Amount of Fair Value Hedging Adjustment Increase (Decrease) Included in the Carrying Amount 5   5   (17)
Long-Term Debt          
Derivative Instruments, Gain (Loss) [Line Items]          
Carrying Amount of Hedged Liabilities 4,511   4,511   5,146
Cumulative Amount of Fair Value Hedging Adjustment Increase (Decrease) Included in the Carrying Amount (129)   (129)   $ (41)
Foreign exchange contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of Pretax (Gain) Loss Recognized in Other Comprehensive Income (1) (12) $ 0 (14) $ 0  
Foreign exchange contracts | Other (income) expense, net          
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of Pretax (Gain) Loss Recognized in Other (income) expense, net for Amounts Excluded from Effectiveness Testing (3) 0 (3) 0  
Euro-denominated notes          
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of Pretax (Gain) Loss Recognized in Other Comprehensive Income (1) (271) 204 (92) 339  
Euro-denominated notes | Other (income) expense, net          
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of Pretax (Gain) Loss Recognized in Other (income) expense, net for Amounts Excluded from Effectiveness Testing $ 0 $ 0 $ 0 $ 0