Supplemental Cash Flow Statement Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash, Cash Equivalents and Restricted Cash
Cash and cash equivalents	$ 1,798	$ 721	$ 448
Current restricted cash	$ 8	$ 7	10
Location of current restricted cash	us-gaap:OtherAssetsCurrent	us-gaap:OtherAssetsCurrent
Noncurrent restricted cash			1
Location of noncurrent restricted cash		us-gaap:OtherAssetsNoncurrent
Total cash, cash equivalents and restricted cash	$ 1,806	$ 728	$ 459	$ 607
Other Non-cash items
PP&E acquired but not yet paid	$ 224	127
Rexam
Other Non-cash items
Payment of indemnification guarantees		$ 45