Segment Information (Reconciliation of Total Segment Income from Operations to Consolidated Income before Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting [Abstract]
Income from operations	$ 79	$ 226	$ 251	$ 554
Interest expense	(37)	(31)	(108)	(89)
Other income (expense), net	12	21	32	32
Income before income taxes	$ 54	$ 216	$ 175	$ 497