CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income	$ 1,736	$ 1,597	$ 1,473
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	2,436	2,143	1,959
Nuclear fuel amortization	118	114	123
Deferred income taxes	140	79	8
Allowance for equity funds used during construction	(75)	(73)	(115)
Earnings from equity method investments	(36)	(62)	(40)
Dividends from equity method investments	37	42	42
Provision for bad debts	73	60	60
Share-based compensation expense	20	31	73
Changes in operating assets and liabilities:
Accounts receivable	(429)	(164)	(154)
Accrued unbilled revenues	(243)	(149)	(3)
Inventories	(203)	(126)	(80)
Other current assets	(58)	(34)	(45)
Accounts payable	195	138	(33)
Net regulatory assets and liabilities	570	(973)	(144)
Other current liabilities	102	(1)	29
Pension and other employee benefit obligations	(49)	(135)	(125)
Other, net	(122)	(140)	(164)
Net Cash Provided by (Used in) Operating Activities, Total	3,932	2,189	2,848
Investing activities
Capital/construction expenditures	(4,638)	(4,244)	(5,369)
Sale of MEC	0	0	684
Purchase of investment securities	(1,332)	(757)	(1,398)
Proceeds from the sale of investment securities	1,297	743	1,378
Other, net	20	(29)	(35)
Net Cash Provided by (Used in) Investing Activities, Total	(4,653)	(4,287)	(4,740)
Financing activities
(Repayments of) proceeds from short-term borrowings, net	(192)	421	(11)
Proceeds from Issuance of Long-term Debt	2,164	2,710	2,940
Repayments of long-term debt	(601)	(417)	(1,001)
Proceeds from Issuance of Common Stock	322	366	727
Payments of Dividends	(1,012)	(935)	(856)
Proceeds from (Payments for) Other Financing Activities	(15)	(10)	(26)
Net Cash Provided by (Used in) Financing Activities, Total	666	2,135	1,773
Net change in cash and cash equivalents	(55)	37	(119)
Cash and Cash Equivalents, at Carrying Value, Beginning Balance	166	129	248
Cash and Cash Equivalents, at Carrying Value, Ending Balance	111	166	129
Supplemental disclosure of cash flow information:
Interest Paid, Excluding Capitalized Interest, Operating Activities	(887)	(788)	(758)
Income Taxes Paid, Net	(15)	(4)	12
Other Noncash Investing and Financing Items [Abstract]
Capital Expenditures Incurred but Not yet Paid	626	501	400
Inventory transfers to plant, property and equipment	78	87	275
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	141	8	369
Allowance for equity funds used during construction	75	73	115
Stock Issued	$ 57	$ 60	$ 67