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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income (numerator for basic and diluted calculations)	$ 180	$ 203	$ 466	$ 413
Shares:
Weighted average outstanding shares (denominator for basic calculation)	66	66	66	66
Equivalent shares from outstanding stock awards	1	1	1	1
Denominator for diluted calculation	67	67	67	67
Diluted earnings per share	$ 2.70	$ 3.03	$ 6.97	$ 6.19
Basic earnings per share	$ 2.72	$ 3.07	$ 7.05	$ 6.28
Net Income (Loss) Attributable to Noncontrolling Interest	$ 1	$ 1	$ 3	$ 3
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 181	$ 204	$ 469	$ 416