v3.10.0.1
Financial Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details)
$ in Millions
Dec. 31, 2018
USD ($)
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 1,499
Cumulative Amount of Fair Value Hedging Adjustment Gains/(Losses) Included in the Carrying Amount of the Hedged Liabilities 5
Long-term debt [Member]  
Derivative [Line Items]  
Carrying Amount of Hedged Liabilities 9,952
Cumulative Amount of Fair Value Hedging Adjustment Gains/(Losses) Included in the Carrying Amount of the Hedged Liabilities $ 45