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Segment and Geographic Information (Reconciliation Of Total Segment Income From Operations To Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting [Abstract]
Income from operations for reportable segments	$ 178	$ 79	$ 36	$ 136	$ 102	$ 226	$ 194	$ 134	$ 429	$ 656	$ 1,408
Interest expense									(142)	(124)	(126)
Other income, net									44	38	52
Income before income taxes									$ 331	$ 570	$ 1,334

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