Consolidated Statements Of Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earning (Accumulated Deficit) [Member]	Other Comprehensive Earnings (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2019	$ 5,920	$ 38	$ 2,735	$ 3,148	$ (119)		$ 118
Balance, shares at Dec. 31, 2019		382
Net earnings (loss)	(1,815)			(1,816)			1
Other comprehensive earnings (loss), net of tax	1				1
Restricted stock grants, net of cancellations, shares		3
Common stock repurchased	(54)					$ (54)
Common stock retired			(54)			54
Common stock retired, shares		(3)
Common stock dividends	(34)			(34)
Share-based compensation	20		20
Share-based compensation, shares		1
Contributions from noncontrolling interests	5						5
Distributions to noncontrolling interests	(3)						(3)
Balance at Mar. 31, 2020	4,040	$ 38	2,701	1,298	(118)		121
Balance, shares at Mar. 31, 2020		383
Balance at Dec. 31, 2020	3,019	$ 38	2,766	208	(127)		134
Balance, shares at Dec. 31, 2020		382
Net earnings (loss)	216			213			3
Other comprehensive earnings (loss), net of tax	23				23
Restricted stock grants, net of cancellations, shares		4
Common stock repurchased	(38)					(38)
Common stock retired			(38)			$ 38
Common stock retired, shares		(2)
Common stock dividends	(203)			(203)
Common stock issued	5,432	$ 29	5,403
Common stock issued, Shares		290
Share-based compensation	41		41
Share-based compensation, shares		1
Distributions to noncontrolling interests	(4)						(4)
Balance at Mar. 31, 2021	$ 8,486	$ 67	$ 8,172	$ 218	$ (104)		$ 133
Balance, shares at Mar. 31, 2021		675