Supplemental Disclosures (Schedule of Analysis for Doubtful Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 112	$ 110	$ 96
Provision charged to operations	32	34	31
Accounts written-off, net of recoveries	(16)	(24)	(17)
Effect of exchange rate changes and other	12	(8)	0
Balance at end of year	$ 140	$ 112	$ 110