Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Net Income (Loss) Attributable to Parent	$ 4,628	$ 2,443
Allowance for equity funds	(122)	(126)
Changes in regulatory assets and liabilities	(87)	108
Deferred income taxes and amortization of investment tax credits	791	(92)
Other Noncash Income (Expense)	6	(44)
Trade receivables and other assets	(1,668)	(594)
Accrued property, income and other taxes, net	97	195
Accounts payable and other liabilities	796	109
Net cash flows from operating activities	4,520	4,660
Capital expenditures	(4,607)	(4,898)
Payments for (Proceeds from) Other Investing Activities	(50)	(54)
Net cash flows from investing activities	(6,633)	(6,035)
Other, net	(60)	(42)
Net cash flows from financing activities	2,937	1,901
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	828	523
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	2,096	1,406
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	90	80
Depreciation and amortization	104	94
Allowance for equity funds	(3)	(2)
Changes in regulatory assets and liabilities	(30)	30
Deferred income taxes and amortization of investment tax credits	3	(5)
Deferred Energy Change	(5)	7
Amortization of Deferred Charges	(6)	(5)
Other Noncash Income (Expense)	0	3
Trade receivables and other assets	(83)	(3)
Increase (Decrease) in Inventories	18	7
Accrued property, income and other taxes, net	8	10
Accounts payable and other liabilities	119	(7)
Net cash flows from operating activities	179	189
Capital expenditures	(192)	(165)
Payments for (Proceeds from) Other Investing Activities	0	(1)
Net cash flows from investing activities	(192)	(164)
Proceeds from Issuance of Long-term Debt	30	125
Repayments of Long-term Debt	0	109
Payments of Ordinary Dividends, Common Stock	20	46
Other, net	(3)	(3)
Net cash flows from financing activities	7	(33)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(6)	(8)
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	$ 26	$ 68