Net Income (Loss) Per Common Share (Calculations For Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net Income (Loss)	$ 2,292	$ 1,843	$ (487)
Denominator:
Basic weighted-average common shares outstanding	156.4	157.0	158.8
Diluted weighted-average shares	157.8	158.1	158.8
Earnings (loss) per share:
Basic (in usd per share)	$ 14.65	$ 11.74	$ (3.06)
Diluted (in usd per share)	$ 14.53	$ 11.66	$ (3.06)
Number of anti-dilutive share-based awards	1.1	1.3	2.2
Stock Options
Denominator:
Effect of stock-based awards	0.8	0.7	0.0
Restricted Stock Units (RSUs)
Denominator:
Effect of stock-based awards	0.6	0.4	0.0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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