Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Income (Loss) Attributable to Parent	$ 622	$ 513
Allowance for equity funds	(32)	(21)
Changes in regulatory assets and liabilities	(52)	94
Deferred income taxes and amortization of investment tax credits	(21)	(166)
Other Noncash Income (Expense)	(1)	(19)
Trade receivables and other assets	144	250
Accrued property, income and other taxes, net	(48)	(60)
Accounts payable and other liabilities	68	(40)
Net cash flows from operating activities	1,488	1,479
Capital expenditures	(1,393)	(1,075)
Net cash flows from investing activities	(1,415)	(1,223)
Net cash flows from financing activities	900	336
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	974	593
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	883	1,283
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,857	1,876
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	22	34
Depreciation and amortization	31	30
Allowance for equity funds	(1)	(1)
Changes in regulatory assets and liabilities	11	12
Deferred income taxes and amortization of investment tax credits	5	6
Deferred Energy Change	(22)	13
Amortization of Deferred Charges	(5)	(4)
Other Noncash Income (Expense)	1	0
Trade receivables and other assets	7	3
Accrued property, income and other taxes, net	(2)	(2)
Accounts payable and other liabilities	(1)	(16)
Net cash flows from operating activities	44	75
Capital expenditures	(52)	(45)
Net cash flows from investing activities	(52)	(45)
Net cash flows from financing activities	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(8)	30
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	76	8
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 68	$ 38