(Loss) Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
(Loss) Income (numerator)
Net (loss) income	$ (201)	$ 57
Net (loss) income applicable to common stock for computing basic (loss) earnings per common share	(201)	57
Net (loss) income as adjusted for purposes of computing diluted (loss) earnings per common share	$ (201)	$ 57
Weighted-average number of shares:
Outstanding during period (in shares)	1,018,252	1,011,350
Non-vested restricted stock (in shares)	(26,983)	(26,495)
Weighted average shares outstanding for computing basic (loss) earnings per common share (in shares)	991,269	984,855
Incremental common shares attributable to dilutive securities:
Shares issuable under convertible securities (in shares)	0	10
Shares issuable under incentive compensation plans (in shares)	0	1,397
Number of shares as adjusted for purposes of computing diluted (loss) earnings per common share (in shares)	991,269	986,262
Basic (loss) earnings per common share (in dollars per share)	$ (0.20)	$ 0.06
Diluted (loss) earnings per common share (in dollars per share)	$ (0.20)	$ 0.06
Stock compensation plan
Incremental common shares attributable to dilutive securities:
Number of shares of common stock excluded from the computation of diluted earnings per share (in shares)	12,000
Restricted stock
Incremental common shares attributable to dilutive securities:
Number of shares of common stock excluded from the computation of diluted earnings per share (in shares)	13,500	20,200