Consolidated Statements of Cash Flows (Unaudited) - NPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income (loss)	$ 653	$ 989
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Allowance for equity funds	(83)	(49)
Deferred energy	63	(504)
Amortization of deferred energy	81	130
Deferred income taxes and investment tax credits, net	(81)	(11)
Other, net	(8)	15
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	67	161
Accrued property, income and other taxes, net	(353)	(177)
Accounts payable and other liabilities	113	(106)
Net cash flows from operating activities	1,986	1,095
Cash flows from investing activities:
Capital expenditures	(2,153)	(1,848)
Net cash flows from investing activities	(2,149)	(1,778)
Cash flows from financing activities:
Net (repayments of) proceeds from short-term debt	(2,618)	699
Other, net	(10)	(17)
Net cash flows from financing activities	2,313	20
Net change in cash and cash equivalents and restricted cash and cash equivalents	2,148	(662)
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,811	1,817
Cash and cash equivalents and restricted cash and cash equivalents at end of period	3,959	1,155
NPC
Cash flows from operating activities:
Net income (loss)	15	4
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation and amortization	92	106
Allowance for equity funds	(8)	(4)
Deferred energy	187	(370)
Amortization of deferred energy	(18)	52
Other changes in regulatory assets and liabilities	(11)	(9)
Deferred income taxes and investment tax credits, net	(27)	(10)
Other, net	0	1
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	85	74
Inventories	(3)	(13)
Accrued property, income and other taxes, net	(17)	1
Accounts payable and other liabilities	1	(44)
Net cash flows from operating activities	296	(212)
Cash flows from investing activities:
Capital expenditures	(346)	(333)
Proceeds from repayment of affiliate note receivable	0	100
Net cash flows from investing activities	(346)	(233)
Cash flows from financing activities:
Repayments of long-term debt	0	(1)
Net (repayments of) proceeds from short-term debt	0	33
Contributions from parent	100	400
Other, net	(5)	(5)
Net cash flows from financing activities	95	427
Net change in cash and cash equivalents and restricted cash and cash equivalents	45	(18)
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	37	60
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 82	$ 42