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Financial Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Short-term investments [Member]  
Derivative [Line Items]  
Carrying Amount of Hedged Assets $ 156
Cumulative Amount of Fair Value Hedging Adjustment Gains/(Losses) Included in the Carrying Amount of the Hedged Assets 0
Long-term investments [Member]  
Derivative [Line Items]  
Carrying Amount of Hedged Assets 45
Cumulative Amount of Fair Value Hedging Adjustment Gains/(Losses) Included in the Carrying Amount of the Hedged Assets (1)
Short-term borrowings, including current portion of long-term debt [Member]  
Derivative [Line Items]  
Carrying Amount of Hedged Liabilities 1,490
Cumulative Amount of Fair Value Hedging Adjustment Gains/(Losses) Included in the Carrying Amount of the Hedged Liabilities 8
Long-term debt [Member]  
Derivative [Line Items]  
Carrying Amount of Hedged Liabilities 9,548
Cumulative Amount of Fair Value Hedging Adjustment Gains/(Losses) Included in the Carrying Amount of the Hedged Liabilities $ 407