Earnings Per Share (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Shares) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings:
Net income	$ 198	$ 344	$ 135	$ 483
Shares:
Weighted average outstanding shares	67	68	67	68
Equivalent shares from outstanding stock awards	1	1	1	1
Denominator for diluted calculation	68	69	68	69
Earnings Per Share:
Basic earnings per share	$ 2.95	$ 5.06	$ 2.01	$ 7.11
Diluted earnings per share	$ 2.92	$ 5.02	$ 2.00	$ 7.06