Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Preferred Stock	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests
Beginning balance at Dec. 31, 2018	$ 21,330	$ 0	$ 179	$ (10,473)	$ 8,046	$ 23,750	$ (172)	$ 0
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(522)					(667)		145
Other comprehensive income (loss), net of tax	(49)						(49)
Dividends on common stock	(2,585)					(2,585)
Dividends on preferred stock	(318)					(318)
Issuance of common stock and other, net	6,939		30		6,909
Issuance of preferred stock	9,762	9,762
Purchases of treasury stock	(180)			(180)
Fair value of noncontrolling interest acquired	4,895							4,895
Noncontrolling interest distributions, net	(131)							(131)
Change in control WES	(4,909)							(4,909)
Ending balance at Dec. 31, 2019	34,232	9,762	209	(10,653)	14,955	20,180	(221)	0
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(14,831)					(14,831)
Other comprehensive income (loss), net of tax	(67)						(67)
Dividends on common stock	(746)					(746)
Dividends on preferred stock	(400)		6		438	(844)
Issuance of common stock and other, net	290		1		289
Shareholder warrants exercised	4				767	(763)
Berkshire Warrants	103				103
Purchases of treasury stock	(12)			(12)
Ending balance at Dec. 31, 2020	18,573	9,762	216	(10,665)	16,552	2,996	(288)	0
Increase (Decrease) in Stockholders' Equity
Net income (loss)	2,322					2,322
Other comprehensive income (loss), net of tax	80						80
Dividends on common stock	(38)					(38)
Dividends on preferred stock	(800)					(800)
Issuance of common stock and other, net	191		1		190
Shareholder warrants exercised	7				7
Purchases of treasury stock	(8)			(8)
Ending balance at Dec. 31, 2021	$ 20,327	$ 9,762	$ 217	$ (10,673)	$ 16,749	$ 4,480	$ (208)	$ 0