CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net income	$ 606	$ 591	$ 543
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	932	831	798
Nuclear fuel amortization	114	123	119
Deferred income taxes	(36)	(67)	(39)
Allowance for equity funds used during construction	(30)	(25)	(25)
Provision for bad debts	24	24	13
Changes in operating assets and liabilities:
Accounts receivable	(89)	(55)	15
Accrued unbilled revenues	(71)	1	20
Inventories	(22)	(14)	(29)
Other current assets	3	(9)	(3)
Accounts payable	69	(1)	(13)
Net regulatory assets and liabilities	(282)	(87)	(140)
Other current liabilities	(5)	(58)	(12)
Pension and other employee benefit obligations	(41)	(54)	(49)
Other, net	(50)	(8)	(29)
Net cash provided by operating activities	1,122	1,192	1,169
Investing activities
Capital/construction expenditures	(1,866)	(1,901)	(1,417)
Purchase of investment securities	(757)	(1,398)	(995)
Proceeds from the sale of investment securities	743	1,378	975
Investments in utility money pool arrangement	(821)	(718)	(219)
Repayments from utility money pool arrangement	730	718	219
Other, net	1	1	(3)
Net cash used in investing activities	(1,970)	(1,920)	(1,440)
Financing activities
(Repayments of) proceeds from short-term borrowings, net	(179)	149	(120)
Borrowings under utility money pool arrangement	434	136	696
Repayments under utility money pool arrangement	(434)	(136)	(696)
Proceeds from issuance of long-term debt	836	677	580
Repayment of long-term debt	0	(300)	0
Capital contributions from parent	649	527	354
Dividends paid to parent	(431)	(408)	(467)
Other, net	0	3	0
Net cash provided by financing activities	875	648	347
Net change in cash, cash equivalents and restricted cash	27	(80)	76
Cash, cash equivalents and restricted cash at beginning of period	46	126	50
Cash, cash equivalents and restricted cash at end of period	73	46	126
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(245)	(230)	(209)
Cash received (paid) for income taxes, net	11	(53)	(105)
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	242	74	95
Inventory transfers to property, plant and equipment	8	24	24
Operating lease right-of-use assets	4	2	629
Allowance for equity funds used during construction	$ 30	$ 25	$ 25