Consolidated Statements of Cash Flows (Unaudited) - NPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 2,285	$ 1,786
Adjustments to reconcile net income to net cash flows from operating activities:
Allowance for equity funds	(56)	(72)
Changes in regulatory assets and liabilities	(199)	(7)
Deferred income taxes and amortization of investment tax credits	613	288
Other, net	(26)	18
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(254)	(783)
Accrued property, income and other taxes, net	76	(605)
Accounts payable and other liabilities	187	240
Net cash flows from operating activities	4,232	1,854
Cash flows from investing activities:
Capital expenditures	(2,848)	(2,793)
Net cash flows from investing activities	(2,975)	(3,838)
Cash flows from financing activities:
Other, net	(28)	(39)
Net cash flows from financing activities	(1,204)	2,798
Net change in cash and cash equivalents and restricted cash and cash equivalents	55	802
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	1,500	2,070
NPC
Cash flows from operating activities:
Net income (loss)	84	79
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	201	181
Allowance for equity funds	(3)	(4)
Changes in regulatory assets and liabilities	(17)	1
Deferred income taxes and amortization of investment tax credits	(20)	(7)
Deferred energy	(1)	15
Amortization of deferred energy	7	(11)
Other, net	0	6
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(83)	(80)
Inventories	5	2
Accrued property, income and other taxes, net	21	28
Accounts payable and other liabilities	116	(3)
Net cash flows from operating activities	310	207
Cash flows from investing activities:
Capital expenditures	(237)	(257)
Net cash flows from investing activities	(237)	(257)
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	(8)	(8)
Net cash flows from financing activities	(21)	50
Net change in cash and cash equivalents and restricted cash and cash equivalents	52	0
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	$ 88	$ 25