Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Decrease (increase) in current assets:
Receivables	$ 43	$ (37)	$ (32)
Inventories	(29)	2	16
Prepaid expenses and other	(58)	(10)	145
Increase (decrease) in current liabilities:
Accounts payable	67	69	(58)
Accrued liabilities	(16)	(49)	(31)
Salaries and wages	(1)	(21)	32
U.S. and foreign income taxes	9	(43)	18
Changes in components of working capital, total	15	(89)	90
Amount of receivables sold	600	454
Interest paid in cash	236	261	261
Income taxes paid in cash
U.S. Income taxes paid in cash	11	4
Non-U.S. Income taxes paid in cash	97	127	99
Total income taxes paid in cash	108	131	99
Interest paid note repurchase premiums	$ 0	$ 18	$ 9