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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting [Abstract]
Income from operations	$ 861	$ 79	$ 1,927	$ 251
Interest expense	(61)	(37)	(130)	(108)
Other income (expense), net	13	12	35	32
Income before income taxes	$ 813	$ 54	$ 1,832	$ 175