Derivative and Other Financial Instruments - Notional Values of Outstanding Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Foreign exchange | Derivatives not designated as hedges
Derivatives, Fair Value [Line Items]
Notional amount of derivative	$ 745	$ 796
Foreign exchange | Derivatives in cash flow hedges
Derivatives, Fair Value [Line Items]
Notional amount of derivative	686	820
Foreign exchange | Derivatives in fair value hedges
Derivatives, Fair Value [Line Items]
Notional amount of derivative	115	74
Commodities | Derivatives in cash flow hedges
Derivatives, Fair Value [Line Items]
Notional amount of derivative	$ 416	$ 428