Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
(Loss) Income (numerator)
Net income (loss)	$ (49)	$ (8,736)	$ 8	$ (8,225)
Net (loss) income applicable to common stock for computing basic (loss) earnings per common share	(49)	(8,736)	8	(8,225)
Net (loss) income as adjusted for purposes of computing diluted (loss) earnings per common share	$ (49)	$ (8,736)	$ 8	$ (8,225)
Weighted-average number of shares:
Outstanding during period (in shares)	1,015,857	1,006,229	1,013,603	1,004,948
Non-vested restricted stock (in shares)	(28,618)	(22,776)	(27,556)	(22,443)
Weighted average shares outstanding for computing basic (loss) earnings per common share (in shares)	987,239	983,453	986,047	982,505
Incremental common shares attributable to dilutive securities:
Shares issuable under convertible securities (in shares)	0	0	10	0
Shares issuable under incentive compensation plans (in shares)	0	0	1,167	0
Number of shares as adjusted for purposes of computing diluted (loss) earnings per common share (in shares)	987,239	983,453	987,224	982,505
Basic (loss) earnings per common share (in dollars per share)	$ (0.05)	$ (8.88)	$ 0.01	$ (8.37)
Diluted (loss) earnings per common share (in dollars per share)	$ (0.05)	$ (8.88)	$ 0.01	$ (8.37)
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)	1,000	1,000		1,000
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)	24,100	21,000	22,200	21,100