Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2018		181,925,000
Beginning balance at Dec. 31, 2018	$ 10,717	$ 4,245	$ 6,112	$ (120)	$ 480
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Implementation of ASU 2018-02	0		25	(25)
Net Income (Loss)	1,172		1,169		3
Dividends declared on common stock	(714)		(714)
Issuance of common stock (in shares)		8,634,000
Issuance of common stock	1,014	$ 1,014
Premium on equity units	(150)	(150)
Issuance costs of equity units	(30)	$ (30)
Contribution of common stock to pension plan (in shares)		815,000
Contribution of common stock to pension plan	100	$ 100
Other comprehensive income (loss), net of tax	(3)			(3)
Purchase of noncontrolling interests, principally SGG	(300)	$ (3)			(297)
Stock-based compensation, net distributions to noncontrolling interests, and other (in shares)		835,000
Stock-based compensation, net distributions to noncontrolling interests, and other	30	$ 57	(5)		(22)
Ending balance (in shares) at Dec. 31, 2019		192,209,000
Ending balance at Dec. 31, 2019	11,836	$ 5,233	6,587	(148)	164
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	1,371		1,368		3
Dividends declared on common stock	(796)		(796)
Issuance of common stock (in shares)		192,000
Issuance of common stock	22	$ 22
Contribution of common stock to pension plan (in shares)		694,000
Contribution of common stock to pension plan	82	$ 82
Other comprehensive income (loss), net of tax	11			11
Stock-based compensation, net distributions to noncontrolling interests, and other (in shares)		676,000
Stock-based compensation, net distributions to noncontrolling interests, and other	$ 63	$ 69	(3)		(3)
Ending balance (in shares) at Dec. 31, 2020	193,770,617	193,771,000
Ending balance at Dec. 31, 2020	$ 12,589	$ 5,406	7,156	(137)	164
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	903		907		(4)
Dividends declared on common stock	(752)		(752)
Repurchase of common stock (in shares)		(529,000)
Repurchase of common stock	(66)	$ (66)
Other comprehensive income (loss), net of tax	15			15
Stock-based compensation, net distributions to noncontrolling interests, and other (in shares)		506,000
Stock-based compensation, net distributions to noncontrolling interests, and other	34	$ 39	(4)		(1)
Separation of DT Midstream	$ (4,010)		(3,869)	10	(151)
Ending balance (in shares) at Dec. 31, 2021	193,747,509	193,748,000
Ending balance at Dec. 31, 2021	$ 8,713	$ 5,379	$ 3,438	$ (112)	$ 8