STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net Income (Loss) Attributable to Parent	$ 318	$ 295	$ 263
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	303	298	232
Deferred income taxes	(47)	22	29
Allowance for equity funds used during construction	(4)	(33)	(27)
Provision for bad debts	6	6	6
Changes in operating assets and liabilities:
Accounts receivable	(29)	(14)	(9)
Increase (Decrease) in Accrued Unbilled Revenues	(10)	0	(1)
Inventories	(21)	(35)	(21)
Prepayments and other	16	(14)	3
Accounts payable	4	8	(9)
Net regulatory assets and liabilities	(154)	(115)	14
Other current liabilities	(1)	13	6
Pension and other employee benefit obligations	(18)	(16)	(18)
Other, net	(4)	(1)	5
Net cash provided by operating activities	359	414	473
Investing activities
Utility capital/construction expenditures	(580)	(1,142)	(844)
Investments in utility money pool arrangement	(83)	(4)	(133)
Receipts from utility money pool arrangement	83	4	133
Net cash used in investing activities	(580)	(1,142)	(844)
Financing activities
(Repayments of) proceeds from short-term borrowings, net	(113)	250	(42)
Proceeds from issuance of long-term debt	247	343	292
Borrowings under utility money pool arrangement	539	561	296
Repayments under utility money pool arrangement	(448)	(561)	(296)
Capital contributions from parent	301	438	426
Dividends paid to parent	(310)	(313)	(333)
Net cash provided by financing activities	216	718	343
Net change in cash and cash equivalents	(5)	(10)	(28)
Cash and cash equivalents at beginning of period	6	16	44
Cash and cash equivalents at end of period	1	6	16
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(108)	(98)	(84)
Cash paid for income taxes, net	21	10	12
Supplemental disclosure of non-cash investing transactions:
Accrued property, plant and equipment additions	37	99	95
Inventory transfers to plant, property and equipment	6	31	23
Operating lease right-of-use assets	0	0	548
Allowance for Funds Used During Construction, Investing Activities	$ 4	$ 33	$ 27