Consolidated Statements of Cash Flows - NPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income attributable to parent	$ 2,721	$ 5,790	$ 6,943
Adjustments to reconcile net income to net cash flows from operating activities:
Allowance for equity funds	(167)	(126)	(165)
Deferred energy	(1,290)	(520)	(62)
Amortization of deferred energy	357	107	(5)
Other changes in regulatory assets and liabilities	(146)	(255)	(348)
Deferred income taxes and investment tax credits, net	(467)	646	1,880
Other, net	59	(57)	(23)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	20	553	(1,318)
Accrued property, income and other taxes, net	397	(489)	(134)
Accounts payable and other liabilities	751	163	501
Net cash flows from operating activities	9,359	8,692	6,224
Cash flows from investing activities:
Capital expenditures	(7,505)	(6,611)	(6,765)
Other, net	12	(74)	76
Net cash flows from investing activities	(7,750)	(5,763)	(13,165)
Cash flows from financing activities:
Net repayments of short-term debt	(867)	(276)	(939)
Other, net	(274)	(70)	(162)
Net cash flows from financing activities	(1,006)	(3,131)	7,103
Net change in cash and cash equivalents and restricted cash and cash equivalents	573	(201)	177
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,244	1,445	1,268
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,817	1,244	1,445
NPC
Cash flows from operating activities:
Net income attributable to parent	298	303	295
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	417	406	361
Allowance for equity funds	(11)	(7)	(7)
Deferred energy	(541)	(245)	(44)
Amortization of deferred energy	160	11	(41)
Other changes in regulatory assets and liabilities	(15)	(19)	(42)
Deferred income taxes and investment tax credits, net	49	0	(10)
Other, net	8	0	2
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(178)	6	45
Inventories	(29)	5	(7)
Accrued property, income and other taxes, net	21	(18)	5
Accounts payable and other liabilities	176	63	(90)
Net cash flows from operating activities	355	505	467
Cash flows from investing activities:
Capital expenditures	(762)	(449)	(455)
Proceeds from sale of assets	0	0	26
Issuance of affiliate note receivable	(100)	0	0
Other, net	0	2	0
Net cash flows from investing activities	(862)	(447)	(429)
Cash flows from financing activities:
Proceeds from long-term debt	694	0	718
Repayments of long-term debt	0	0	(575)
Net repayments of short-term debt	(180)	180	0
Dividends paid	0	(213)	(155)
Proceeds from equity contributions	25	0	0
Other, net	(17)	(16)	(15)
Net cash flows from financing activities	522	(49)	(27)
Net change in cash and cash equivalents and restricted cash and cash equivalents	15	9	11
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	45	36	25
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 60	$ 45	$ 36