Consolidated Statements of Cash Flows (Unaudited) - NPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 4,207	$ 4,628
Adjustments to reconcile net income to net cash flows from operating activities:
Allowance for equity funds	(90)	(122)
Changes in regulatory assets and liabilities	(518)	(87)
Deferred income taxes and investment tax credits, net	661	791
Other, net	(88)	(6)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(13)	(1,668)
Accrued property, income and other taxes, net	(29)	97
Accounts payable and other liabilities	427	796
Net cash flows from operating activities	6,984	4,520
Cash flows from investing activities:
Capital expenditures	(4,594)	(4,607)
Other, net	(91)	37
Net cash flows from investing activities	(3,528)	(6,633)
Cash flows from financing activities:
Other, net	(44)	(52)
Net cash flows from financing activities	(1,960)	2,937
Net change in cash and cash equivalents and restricted cash and cash equivalents	1,497	828
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,445	1,268
Cash and cash equivalents and restricted cash and cash equivalents at end of period	2,942	2,096
NPC
Cash flows from operating activities:
Net income (loss)	301	273
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	304	273
Allowance for equity funds	(5)	(5)
Changes in regulatory assets and liabilities	(11)	38
Deferred income taxes and investment tax credits, net	(19)	(3)
Deferred energy	(154)	(38)
Amortization of deferred energy	(7)	(30)
Other, net	1	5
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(133)	(112)
Inventories	3	(4)
Accrued property, income and other taxes, net	28	48
Accounts payable and other liabilities	97	(39)
Net cash flows from operating activities	405	406
Cash flows from investing activities:
Capital expenditures	(323)	(343)
Proceeds from sale of assets	0	26
Other, net	1	0
Net cash flows from investing activities	(322)	(317)
Cash flows from financing activities:
Proceeds from long-term debt	0	718
Repayments of long-term debt	0	(575)
Dividends paid	(13)	(85)
Other, net	(12)	(12)
Net cash flows from financing activities	(25)	46
Net change in cash and cash equivalents and restricted cash and cash equivalents	58	135
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	36	25
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 94	$ 160