STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities:
Net income (loss)	$ 1,486,000,000	$ (773,000,000)	$ 791,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,316,000,000	1,189,000,000	1,225,000,000
Deferred income taxes	213,000,000	(429,000,000)	69,000,000
Goodwill impairment and loss from reclassification to held for sale	0	175,000,000	48,000,000
Goodwill impairment	0	185,000,000	0
Loss (gain) on equity securities	172,000,000	(49,000,000)	(282,000,000)
Loss (gain) on indexed debt securities	(50,000,000)	60,000,000	292,000,000
Equity in (earnings) losses of unconsolidated affiliates	(339,000,000)	1,428,000,000	(230,000,000)
Distributions from unconsolidated affiliates	155,000,000	113,000,000	261,000,000
Pension contributions	(61,000,000)	(86,000,000)	(109,000,000)
Changes in other assets and liabilities, excluding acquisitions:
Accounts receivable and unbilled revenues, net	(98,000,000)	90,000,000	226,000,000
Inventory	(140,000,000)	9,000,000	(52,000,000)
Taxes receivable	81,000,000	24,000,000	(106,000,000)
Accounts payable	175,000,000	2,000,000	(455,000,000)
Net regulatory assets and liabilities	(2,295,000,000)	(107,000,000)	(22,000,000)
Other current assets and liabilities	56,000,000	104,000,000	(195,000,000)
Other assets and liabilities	(53,000,000)	25,000,000	49,000,000
Other operating activities, net	85,000,000	35,000,000	128,000,000
Net cash provided by operating activities	22,000,000	1,995,000,000	1,638,000,000
Cash Flows from Investing Activities:
Capital expenditures	(3,164,000,000)	(2,596,000,000)	(2,506,000,000)
Acquisitions, net of cash acquired	0	0	(5,991,000,000)
Transaction costs related to Enable Merger (Note 4)	(49,000,000)	0	0
Cash received related to Enable Merger	5,000,000	0	0
Distributions from unconsolidated affiliates in excess of cumulative earnings	0	80,000,000	42,000,000
Proceeds from sale of equity securities, net of transaction costs	1,320,000,000	0	0
Proceeds from divestitures (Note 4)	22,000,000	1,215,000,000	0
Other investing activities, net	15,000,000	36,000,000	34,000,000
Net cash used in investing activities	(1,851,000,000)	(1,265,000,000)	(8,421,000,000)
Cash Flows from Financing Activities:
Decrease in short-term borrowings, net	(27,000,000)	0	0
Payment of obligation for finance lease	(179,000,000)	0	0
Borrowings from revolving credit facilities	0	1,050,000,000	135,000,000
Repayments of revolving credit facilities	0	(1,050,000,000)	(135,000,000)
Proceeds from (payments of) commercial paper, net	1,132,000,000	(761,000,000)	1,891,000,000
Proceeds from long-term debt	4,493,000,000	799,000,000	2,916,000,000
Payments of long-term debt, including make-whole premiums	(2,968,000,000)	(1,724,000,000)	(1,302,000,000)
Payment of debt issuance costs	(38,000,000)	(8,000,000)	(20,000,000)
Payment of dividends on Common Stock	(385,000,000)	(392,000,000)	(577,000,000)
Payment of dividends on Preferred Stock	(107,000,000)	(137,000,000)	(118,000,000)
Proceeds from issuance of Common Stock, net	0	672,000,000	0
Proceeds from issuance of Series C Preferred stock, net	0	723,000,000	0
Other financing activities, net	(5,000,000)	(6,000,000)	(14,000,000)
Net cash provided by (used in) financing activities	1,916,000,000	(834,000,000)	2,776,000,000
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	87,000,000	(104,000,000)	(4,007,000,000)
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	167,000,000	271,000,000	4,278,000,000
Cash, Cash Equivalents and Restricted Cash at End of Year	254,000,000	167,000,000	271,000,000
Gain on Enable Merger	$ (681,000,000)	$ 0	$ 0