Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Loss (numerator)
Net loss	$ (148)	$ (78)	$ (140)	$ (8,303)
Net loss applicable to common stock for computing basic loss per common share	(148)	(78)	(140)	(8,303)
Net loss as adjusted for purposes of computing diluted loss per common share	$ (148)	$ (78)	$ (140)	$ (8,303)
Weighted-average number of shares:
Outstanding during period (in shares)	1,016,211	1,008,523	1,014,473	1,006,140
Non-vested restricted stock (in shares)	(27,417)	(24,973)	(27,510)	(23,287)
Weighted average shares outstanding for computing basic loss per common share (in shares)	988,794	983,550	986,963	982,853
Incremental common shares attributable to dilutive securities:
Shares issuable under convertible securities (in shares)	0	0	0	0
Shares issuable under incentive compensation plans (in shares)	0	0	0	0
Number of shares as adjusted for purposes of computing diluted loss per common share (in shares)	988,794	983,550	986,963	982,853
Basic loss per common share (in dollars per share)	$ (0.15)	$ (0.08)	$ (0.14)	$ (8.45)
Diluted loss per common share (in dollars per share)	$ (0.15)	$ (0.08)	$ (0.14)	$ (8.45)
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	1,000	5,000	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)	11,300	24,500	18,500	22,200