Segment Information (Reconciliation of Total Segment Income from Operations to Consolidated Income before Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting [Abstract]
Income from operations	$ 720	$ 36	$ 1,066	$ 172
Interest expense	(36)	(40)	(69)	(71)
Other income (expense), net	10	9	22	20
Income before income taxes	$ 694	$ 5	$ 1,019	$ 121