Consolidated Statements of Cash Flows (Unaudited) - NPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ (129)	$ 4
Adjustments to reconcile net (loss) income to net cash flows from operating activities:
Allowance for equity funds	(38)	(26)
Changes in regulatory assets and liabilities	(42)	(9)
Deferred income taxes and investment tax credits, net	(203)	(135)
Other, net	6	9
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	333	(249)
Accrued property, income and other taxes, net	(347)	(453)
Accounts payable and other liabilities	91	19
Net cash flows from operating activities	2,221	1,525
Cash flows from investing activities:
Capital expenditures	(1,553)	(1,295)
Net cash flows from investing activities	(1,572)	(1,374)
Cash flows from financing activities:
Net (repayments of) proceeds from short-term debt	(165)	409
Other, net	(240)	(9)
Net cash flows from financing activities	(310)	(191)
Net change in cash and cash equivalents and restricted cash and cash equivalents	338	(39)
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,244	1,445
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,582	1,406
NPC
Cash flows from operating activities:
Net income (loss)	(2)	2
Adjustments to reconcile net (loss) income to net cash flows from operating activities:
Depreciation and amortization	103	101
Allowance for equity funds	(3)	(1)
Changes in regulatory assets and liabilities	(8)	(15)
Deferred income taxes and investment tax credits, net	5	(10)
Deferred energy	(51)	41
Amortization of deferred energy	13	0
Other, net	4	(1)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	33	41
Inventories	3	4
Accrued property, income and other taxes, net	(15)	3
Accounts payable and other liabilities	3	14
Net cash flows from operating activities	85	179
Cash flows from investing activities:
Capital expenditures	(189)	(106)
Net cash flows from investing activities	(189)	(106)
Cash flows from financing activities:
Proceeds from long-term debt	200	0
Net (repayments of) proceeds from short-term debt	(76)	0
Other, net	(4)	(5)
Net cash flows from financing activities	120	(5)
Net change in cash and cash equivalents and restricted cash and cash equivalents	16	68
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	45	36
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 61	$ 104