Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Net Income (Loss) Attributable to Parent	$ 1,306	$ 885
Allowance for equity funds	(70)	(45)
Changes in regulatory assets and liabilities	1	206
Deferred income taxes and amortization of investment tax credits	25	(264)
Other Noncash Income (Expense)	(23)	(26)
Trade receivables and other assets	(550)	(226)
Accrued property, income and other taxes, net	(140)	174
Accounts payable and other liabilities	32	16
Net cash flows from operating activities	2,134	2,818
Capital expenditures	(2,750)	(2,779)
Net cash flows from investing activities	(2,959)	(3,019)
Other, net	(25)	(23)
Net cash flows from financing activities	1,447	465
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	623	261
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Start	883	1,283
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Period	1,506	1,544
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	36	41
Depreciation and amortization	63	59
Allowance for equity funds	(1)	(2)
Changes in regulatory assets and liabilities	20	19
Deferred income taxes and amortization of investment tax credits	2	2
Deferred Energy Change	(13)	26
Amortization of Deferred Charges	(6)	(5)
Other Noncash Income (Expense)	1	0
Trade receivables and other assets	12	21
Increase (Decrease) in Inventories	8	0
Accrued property, income and other taxes, net	7	11
Accounts payable and other liabilities	(23)	(10)
Net cash flows from operating activities	88	162
Capital expenditures	(99)	(94)
Net cash flows from investing activities	(99)	(94)
Proceeds from Issuance of Long-term Debt	125	0
Repayments of Long-term Debt	109	0
Payments of Ordinary Dividends, Common Stock	46	0
Other, net	(2)	(1)
Net cash flows from financing activities	(32)	(1)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(43)	67
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Start	76	8
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Period	$ 33	$ 75