Consolidated Statements of Cash Flows - NPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ 3,020	$ 2,721	$ 5,790
Adjustments to reconcile net income to net cash flows from operating activities:
Allowance for equity funds	(267)	(167)	(126)
Net power cost deferrals	(629)	(1,290)	(520)
Amortization of deferred energy	354	357	107
Other changes in regulatory assets and liabilities	(260)	(146)	(255)
Deferred income taxes and investment tax credits, net	(257)	(467)	646
Other, net	(46)	59	(57)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(134)	150	553
Accrued property, income and other taxes, net	(58)	397	(489)
Accounts payable and other liabilities	280	579	163
Net cash flows from operating activities	7,132	9,359	8,692
Cash flows from investing activities:
Capital expenditures	(9,148)	(7,505)	(6,611)
Other, net	17	(28)	(94)
Net cash flows from investing activities	(5,899)	(7,750)	(5,763)
Cash flows from financing activities:
Net proceeds from (repayments of) short-term debt	3,024	(867)	(276)
Other, net	(54)	(274)	(70)
Net cash flows from financing activities	(1,250)	(1,006)	(3,131)
Net change in cash and cash equivalents and restricted cash and cash equivalents	(6)	573	(201)
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,817	1,244	1,445
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,811	1,817	1,244
NPC
Cash flows from operating activities:
Net income (loss)	260	298	303
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	432	417	406
Allowance for equity funds	(21)	(11)	(7)
Net power cost deferrals	14	(541)	(245)
Amortization of deferred energy	40	160	11
Other changes in regulatory assets and liabilities	(13)	(15)	(19)
Deferred income taxes and investment tax credits, net	26	49	0
Other, net	(1)	8	0
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(3)	(178)	6
Inventories	(36)	(29)	5
Accrued property, income and other taxes, net	39	21	(18)
Accounts payable and other liabilities	24	176	63
Net cash flows from operating activities	761	355	505
Cash flows from investing activities:
Capital expenditures	(1,409)	(762)	(449)
Net proceeds from (issuance of) affiliate note receivable	100	(100)	0
Other, net	0	0	2
Net cash flows from investing activities	(1,309)	(862)	(447)
Cash flows from financing activities:
Proceeds from long-term debt	494	694	0
Repayments of long-term debt	(300)	0	0
Net proceeds from (repayments of) short-term debt	0	(180)	180
Dividends paid	(50)	0	(213)
Proceeds from equity contributions	400	25	0
Other, net	(19)	(17)	(16)
Net cash flows from financing activities	525	522	(49)
Net change in cash and cash equivalents and restricted cash and cash equivalents	(23)	15	9
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	60	45	36
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 37	$ 60	$ 45