Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net Income (Loss) Attributable to Parent	$ 670	$ 622
Allowance for equity funds	(34)	(32)
Changes in regulatory assets and liabilities	0	(52)
Deferred income taxes and amortization of investment tax credits	47	(21)
Other Noncash Income (Expense)	(63)	(1)
Trade receivables and other assets	(118)	144
Accrued property, income and other taxes, net	(364)	(48)
Accounts payable and other liabilities	117	68
Net cash flows from operating activities	1,165	1,488
Capital expenditures	(1,356)	(1,393)
Net cash flows from investing activities	(1,474)	(1,415)
Other, net	(34)	(21)
Net cash flows from financing activities	1,358	900
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	1,036	974
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	2,304	1,857
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	25	22
Depreciation and amortization	34	31
Allowance for equity funds	(1)	(1)
Changes in regulatory assets and liabilities	(10)	11
Deferred income taxes and amortization of investment tax credits	(3)	5
Deferred Energy Change	14	(22)
Amortization of Deferred Charges	4	(5)
Other Noncash Income (Expense)	(1)	1
Trade receivables and other assets	1	7
Increase (Decrease) in Inventories	3	0
Accrued property, income and other taxes, net	4	(2)
Accounts payable and other liabilities	(12)	(1)
Net cash flows from operating activities	54	44
Capital expenditures	(52)	(52)
Net cash flows from investing activities	(52)	(52)
Other, net	(1)	0
Net cash flows from financing activities	(1)	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	1	(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	$ 33	$ 68