Derivative and Other Financial Instruments - Notional Values of Outstanding Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Foreign exchange | Derivatives not designated as hedges
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 1,090		$ 796
Foreign exchange | Derivatives in cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	406		820
Foreign exchange | Derivatives in fair value hedges
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	142		74
Foreign exchange | Derivatives designated as net investment hedges
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,075		875
Commodities | Derivatives in cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	387		428
Interest Rate Swap [Member] | Derivatives in cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 200	$ 200	$ 0