Derivative Instruments - Derivatives and Hedges (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Derivatives and Hedges
Net cash proceeds for hedging activity		$ (28)
Commodity forwards contracts | Cash Flow Hedges
Derivatives and Hedges
Unrecognized (loss) gain included in Accumulated OCI	$ 2	2	$ 1	$ 7
Cross-currency swap | Cash Flow Hedges
Derivatives and Hedges
Unrecognized (loss) gain included in Accumulated OCI	(18)	(18)	(9)	$ (8)
Net cash proceeds for hedging activity	15
Interest rate swaps | Derivatives designated as hedging instruments
Derivatives and Hedges
Net cash proceeds for hedging activity	13
Interest rate swaps | Cash Flow Hedges
Derivatives and Hedges
Unrecognized (loss) gain included in Accumulated OCI	(1)	(1)
Interest rate swaps | Cash Flow Hedges | Maximum
Derivatives and Hedges
Unrecognized (loss) gain included in Accumulated OCI			(1)
Interest rate swaps | Net investment hedges
Derivatives and Hedges
Unrecognized (loss) gain included in Accumulated OCI	$ 5	$ 5	$ 4