Supplemental Financial Information Supplemental Financial Information - Other (Expense) Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other (Expense) Income [Abstract]
Interest and Other Income	$ 5	$ 5	$ 3
Foreign currency fluctuations and foreign exchange contracts	(23)	(26)	(26)
Employee Benefit Plans Amounts Included in Other Income Expense	(82)	45	(15)
Bank Related Fees Included in Other Income Expense	(7)	(8)	(8)
gain on equity liquidations	37	0	0
Other Nonoperating Expense	3		0
Other Nonoperating Income (Expense)	$ (73)	$ 16	$ (46)