Consolidated Statements of Cash Flows (Unaudited) - NPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income (loss)	$ 989	$ (129)
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Allowance for equity funds	(49)	(38)
Deferred income taxes and investment tax credits, net	(11)	(203)
Net power cost deferrals	(504)	(72)
Amortization of net power cost deferrals	130	47
Other, net	15	6
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	120	333
Accrued property, income and other taxes, net	(177)	(347)
Accounts payable and other liabilities	294	91
Net cash flows from operating activities	1,095	2,221
Cash flows from investing activities:
Capital expenditures	(1,848)	(1,553)
Net cash flows from investing activities	(1,778)	(1,572)
Cash flows from financing activities:
Net proceeds from (repayments of) short-term debt	699	(165)
Other, net	(17)	(240)
Net cash flows from financing activities	20	(310)
Net change in cash and cash equivalents and restricted cash and cash equivalents	(662)	338
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,817	1,244
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,155	1,582
NPC
Cash flows from operating activities:
Net income (loss)	4	(2)
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation and amortization	106	103
Allowance for equity funds	(4)	(3)
Other changes in regulatory assets and liabilities	(9)	(8)
Deferred income taxes and investment tax credits, net	(10)	5
Net power cost deferrals	(370)	(51)
Amortization of net power cost deferrals	52	13
Other, net	1	4
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	74	33
Inventories	(13)	3
Accrued property, income and other taxes, net	1	(15)
Accounts payable and other liabilities	(44)	3
Net cash flows from operating activities	(212)	85
Cash flows from investing activities:
Capital expenditures	(333)	(189)
Proceeds from repayment of affiliate note receivable	100	0
Net cash flows from investing activities	(233)	(189)
Cash flows from financing activities:
Net (repayments of) proceeds from long-term debt	(1)	200
Net proceeds from (repayments of) short-term debt	33	(76)
Contributions from parent	400	0
Other, net	(5)	(4)
Net cash flows from financing activities	427	120
Net change in cash and cash equivalents and restricted cash and cash equivalents	(18)	16
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	60	45
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 42	$ 61