Schedule I - Condensed Financial Information - Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current Assets
Cash and temporary cash investments	$ 1,282	$ 992
Taxes receivable	10	13
Prepayments	264	295
Other current assets	176	233
TOTAL CURRENT ASSETS	12,972	5,551
Investments in subsidiaries and others	841	853
Goodwill	408	439
Pension and retiree benefits - asset	3,269	1,654
Other deferred charges and noncurrent assets	8,486	8,116
TOTAL ASSETS	69,065	63,116	$ 62,895
Current Liabilities
Long-term debt due within one year	1,002	440
Term Loan	400	0
Notes payable	2,640	1,488
Accounts payable	1,955	1,497
Accrued taxes	102	104
Accrued interest	153	151
Other current liabilities	444	461
TOTAL CURRENT LIABILITIES	11,336	5,427
Long-term debt	22,439	22,604
Shareholders’ Equity
Equity	20,687	20,037
TOTAL LIABILITIES AND EQUITY	69,065	63,116
Parent Company
Current Assets
Cash and temporary cash investments	191	19
Other receivables, net allowance for uncollectible accounts	4	0
Taxes receivable	5	3
Accounts receivable from affiliated companies	1,337	1,199
Prepayments	9	28
Other current assets	32	14
TOTAL CURRENT ASSETS	1,578	1,263
Investments in subsidiaries and others	20,839	19,951
Goodwill	406	406
Pension and retiree benefits - asset	5	0
Other deferred charges and noncurrent assets	2	8
TOTAL ASSETS	22,830	21,628
Current Liabilities
Long-term debt due within one year	649	293
Term Loan	400	0
Notes payable	282	50
Accounts payable	39	1
Accounts payable to affiliated companies	11	10
Accrued taxes	7	2
Accrued taxes to affiliated companies	506	507
Accrued interest	7	2
Other current liabilities	7	7
TOTAL CURRENT LIABILITIES	1,908	872
Deferred income taxes and unamortized investment tax credits	235	72
Total Liabilities	2,143	1,591
Long-term debt	0	647
Shareholders’ Equity
Common stock, including additional paid-in capital	9,840	9,748
Retained earnings	10,847	10,289
Equity	20,687	20,037
TOTAL LIABILITIES AND EQUITY	$ 22,830	$ 21,628