Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Net Income (Loss) Attributable to Parent	$ 1,786	$ 1,306
Allowance for equity funds	(72)	(70)
Changes in regulatory assets and liabilities	(7)	1
Deferred income taxes and amortization of investment tax credits	288	25
Other Noncash Income (Expense)	(18)	(23)
Trade receivables and other assets	(783)	(550)
Accrued property, income and other taxes, net	(605)	(140)
Accounts payable and other liabilities	240	32
Net cash flows from operating activities	1,854	2,134
Capital expenditures	(2,793)	(2,750)
Net cash flows from investing activities	(3,838)	(2,959)
Other, net	(42)	(25)
Net cash flows from financing activities	2,798	1,447
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	802	623
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Start	1,268	883
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Period	2,070	1,506
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	38	36
Depreciation and amortization	68	63
Allowance for equity funds	(2)	(1)
Changes in regulatory assets and liabilities	(24)	20
Deferred income taxes and amortization of investment tax credits	(6)	2
Deferred Energy Change	21	(13)
Amortization of Deferred Charges	1	(6)
Other Noncash Income (Expense)	(1)	1
Trade receivables and other assets	11	12
Increase (Decrease) in Inventories	19	8
Accrued property, income and other taxes, net	10	7
Accounts payable and other liabilities	18	(23)
Net cash flows from operating activities	117	88
Capital expenditures	(110)	(99)
Net cash flows from investing activities	(110)	(99)
Proceeds from Issuance of Long-term Debt	0	125
Repayments of Long-term Debt	0	109
Payments of Ordinary Dividends, Common Stock	20	46
Other, net	(2)	(2)
Net cash flows from financing activities	(22)	(32)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(15)	(43)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Start	32	76
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Period	$ 17	$ 33