SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - CASH FLOWS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 3,842	$ 2,591	$ 3,088
Expenditures for property, plant and equipment	(5,015)	(4,676)	(3,708)
Disbursement for note receivable	(305)	0	0
Distributions from investments	941	651	247
Other	11	15	21
Net cash (used in) provided by investing activities	(5,508)	553	(4,593)
Common stock dividends paid	(1,331)	(1,174)	(993)
Preferred dividends paid	(99)	(157)	(142)
Proceeds from Issuance of Preferred Stock and Preference Stock	0	891	0
Issuances of common stock, net	5	11	1,830
Repurchases of common stock	(339)	(566)	(26)
Issuances of long-term debt	3,773	6,051	4,296
Payments on long-term debt	(5,489)	(5,864)	(3,667)
Increase in loans from affiliates, net	38	7	3
Purchases of noncontrolling interest	(224)	(248)	(30)
Other	(199)	(50)	(49)
Net cash provided by financing activities	1,260	(2,373)	1,475
Effect of exchange rate changes in continuing operations	2	0	0
Increase (decrease) in cash and cash equivalents	(404)	768	(29)
SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING ACTIVITIES
Common dividends issued in stock	0	22	55
Conversion of mandatory convertible preferred stock	2,258	0	0
Parent Company
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	(255)	(978)	294
Expenditures for property, plant and equipment	(8)	(9)	(8)
Capital contributions to investees	(1,005)	(364)	(1,528)
Disbursement for note receivable	(305)	0	0
Distributions from investments	1,552	3,616	0
(Increase) decrease in loans to affiliates, net	(20)	2	0
Other	0	0	4
Net cash (used in) provided by investing activities	214	3,245	(1,532)
Common stock dividends paid	(1,331)	(1,174)	(993)
Preferred dividends paid	(99)	(157)	(142)
Proceeds from Issuance of Preferred Stock and Preference Stock	0	891	0
Issuances of common stock, net	5	11	1,830
Repurchases of common stock	(339)	(566)	(26)
Issuances of long-term debt	990	1,599	758
Payments on long-term debt	(3,200)	(3,700)	(1,500)
Increase in short-term debt	1,240	0	0
Increase in loans from affiliates, net	1,092	1,194	1,328
Purchases of noncontrolling interest	(217)	0	0
Proceeds from sale of noncontrolling interest	1,846	0	0
Equity transaction costs with third parties	0	(4)	0
Debt issuance costs	0	(1)	(25)
Make-whole premiums related to early redemptions of debt	(121)	0	0
Other	(2)	0	0
Net cash provided by financing activities	(136)	(1,907)	1,230
Effect of exchange rate changes in continuing operations	(1)	0	0
Increase (decrease) in cash and cash equivalents	(178)	360	(8)
Cash and cash equivalents, January 1	366	6	14
Cash and cash equivalents, December 31	188	366	6
SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING ACTIVITIES
Issuance of common stock in exchange for NCI and related AOCI	1,373	0	0
Common dividends issued in stock	0	22	55
Common dividends declared but not paid	349	301	283
Conversion of mandatory convertible preferred stock	2,258	0	0
Preferred dividends declared but not paid	11	47	36
Equitization of amounts due from affiliates	$ 4,351	$ 0	$ 0