STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities:
Net income (loss)	$ 1,057,000,000	$ 1,486,000,000	$ (773,000,000)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	1,288,000,000	1,316,000,000	1,189,000,000
Deferred income taxes	20,000,000	213,000,000	(429,000,000)
Goodwill impairment and loss from reclassification to held for sale	0	0	175,000,000
Goodwill impairment	0	0	185,000,000
Gain on Enable Merger	(303,000,000)	(681,000,000)	0
Loss (gain) on equity securities	227,000,000	172,000,000	(49,000,000)
Loss (gain) on indexed debt securities	(325,000,000)	(50,000,000)	60,000,000
Equity in (earnings) losses of unconsolidated affiliates	0	(339,000,000)	1,428,000,000
Distributions from unconsolidated affiliates	0	155,000,000	113,000,000
Pension contributions	(35,000,000)	(61,000,000)	(86,000,000)
Changes in other assets and liabilities:
Accounts receivable and unbilled revenues, net	(461,000,000)	(98,000,000)	90,000,000
Inventory	(259,000,000)	(140,000,000)	9,000,000
Taxes receivable	(19,000,000)	81,000,000	24,000,000
Accounts payable	203,000,000	175,000,000	2,000,000
Net regulatory assets and liabilities	234,000,000	(2,295,000,000)	(107,000,000)
Other current assets and liabilities	(5,000,000)	56,000,000	104,000,000
Other non-current assets and liabilities	109,000,000	(53,000,000)	25,000,000
Other operating activities, net	79,000,000	85,000,000	35,000,000
Net cash provided by operating activities	1,810,000,000	22,000,000	1,995,000,000
Cash Flows from Investing Activities:
Capital expenditures	(4,419,000,000)	(3,164,000,000)	(2,596,000,000)
Transaction costs related to Enable Merger (Note 4)	0	(49,000,000)	0
Cash received related to Enable Merger	0	5,000,000	0
Distributions from unconsolidated affiliates in excess of cumulative earnings	0	0	80,000,000
Proceeds from sale of equity securities, net of transaction costs	702,000,000	1,320,000,000	0
Proceeds from divestitures (Note 4)	2,075,000,000	22,000,000	1,215,000,000
Other investing activities, net	14,000,000	15,000,000	36,000,000
Net cash used in investing activities	(1,628,000,000)	(1,851,000,000)	(1,265,000,000)
Cash Flows from Financing Activities:
Increase (decrease) in short-term borrowings, net	452,000,000
Increase (decrease) in short-term borrowings, net		(27,000,000)	0
Payment of obligation for finance lease	(485,000,000)	(179,000,000)	0
Borrowings from revolving credit facilities	0	0	1,050,000,000
Repayments of revolving credit facilities	0	0	(1,050,000,000)
Proceeds from (payments of) commercial paper, net	(74,000,000)	1,132,000,000	(761,000,000)
Proceeds from long-term debt	2,089,000,000	4,493,000,000	799,000,000
Payments of long-term debt, including make-whole premiums	(1,795,000,000)	(2,968,000,000)	(1,724,000,000)
Payment of debt issuance costs	(36,000,000)	(38,000,000)	(8,000,000)
Payment of dividends on Common Stock	(440,000,000)	(385,000,000)	(392,000,000)
Payment of dividends on Preferred Stock	(49,000,000)	(107,000,000)	(137,000,000)
Proceeds from issuance of Common Stock, net	0	0	672,000,000
Proceeds from issuance of Series C Preferred stock, net	0	0	723,000,000
Other financing activities, net	(7,000,000)	(5,000,000)	(6,000,000)
Net cash provided by (used in) financing activities	(345,000,000)	1,916,000,000	(834,000,000)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(163,000,000)	87,000,000	(104,000,000)
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	254,000,000	167,000,000	271,000,000
Cash, Cash Equivalents and Restricted Cash at End of Year	$ 91,000,000	$ 254,000,000	$ 167,000,000