SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - CASH FLOWS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 1,142	$ 3,842	$ 2,591
Expenditures for property, plant and equipment	(5,357)	(5,015)	(4,676)
Disbursement for note receivable	0	(305)	0
Distributions from investments	854	941	651
Other	6	11	15
Net cash (used in) provided by investing activities	(5,039)	(5,508)	553
Common dividends paid	(1,430)	(1,331)	(1,174)
Preferred dividends paid	(44)	(99)	(157)
Issuances of preferred stock, net	0	0	891
Issuances of common stock, net	4	5	11
Repurchases of common stock	(478)	(339)	(566)
Issuances of debt (maturities greater than 90 days)	9,984	3,773	6,051
Payments on debt (maturities greater than 90 days)	(4,510)	(5,489)	(5,864)
(Decrease) increase in loans from affiliates, net	626	38	7
Purchases of noncontrolling interests	0	(224)	(248)
Other	(35)	(199)	(50)
Net cash provided by (used in) financing activities	3,779	1,260	(2,373)
Effect of exchange rate changes in continuing operations	(1)	2	0
(Decrease) increase in cash and cash equivalents	(119)	(404)	768
SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING ACTIVITIES
Conversion of mandatory convertible preferred stock	0	2,258	0
Parent Company
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	775	(255)	(978)
Expenditures for property, plant and equipment	(7)	(8)	(9)
Capital contributions to investees	(661)	(1,005)	(364)
Disbursement for note receivable	0	(305)	0
Distributions from investments	0	1,552	3,616
Purchases of trust assets	(114)	0	0
Proceeds from sales of trust assets	123	0	0
(Increase) decrease in loans to affiliates, net	(92)	(20)	2
Other	(3)	0	0
Net cash (used in) provided by investing activities	(754)	214	3,245
Common dividends paid	(1,430)	(1,331)	(1,174)
Preferred dividends paid	(44)	(99)	(157)
Issuances of preferred stock, net	0	0	891
Issuances of common stock, net	4	5	11
Repurchases of common stock	(478)	(339)	(566)
Issuances of debt (maturities greater than 90 days)	1,569	990	1,599
Payments on debt (maturities greater than 90 days)	(322)	(3,200)	(3,700)
(Decrease) increase in short-term debt	(785)	1,240	0
(Decrease) increase in loans from affiliates, net	(226)	1,092	1,194
Purchases of noncontrolling interests	0	(217)	0
Proceeds from sale of noncontrolling interests	1,732	1,846	0
Equity transaction costs with third parties	0	0	(4)
Make-whole premiums related to early redemptions of debt	0	(121)	0
Other	(8)	(2)	(1)
Net cash provided by (used in) financing activities	12	(136)	(1,907)
Effect of exchange rate changes in continuing operations	(1)	(1)	0
(Decrease) increase in cash and cash equivalents	32	(178)	360
Cash and cash equivalents, January 1	188	366	6
Cash and cash equivalents, December 31	220	188	366
SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING ACTIVITIES
Issuance of common stock in exchange for NCI and related AOCI	0	1,373	0
Common dividends declared but not paid	360	349	301
Conversion of mandatory convertible preferred stock	0	2,258	0
Preferred dividends declared but not paid	11	11	47
Equitization of amounts due from affiliates	$ 93	$ 4,351	$ 0