Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 2,198	$ 2,062
Allowance for equity funds	(59)	(147)
Deferred income taxes and amortization of investment tax credits	573	546
Increase (Decrease) in Regulatory Assets and Liabilities	17	41
Other Noncash Income (Expense)	(13)	60
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(98)	(348)
Accrued property, income and other taxes	390	713
Accounts payable and other liabilities	170	183
Net cash flows from operating activities	5,118	4,824
Capital expenditures	(3,179)	(3,521)
Net cash flows from investing activities	(4,373)	(4,117)
Proceeds from Issuance of Long-term Debt	91	0
Repayments of Long-term Debt	(1,344)	(1,500)
Net cash flows from financing activities	(330)	(792)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at beginning of period	721	1,108
Cash and cash equivalents at end of period	1,142	1,018
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	85	65
Utilities Operating Expense, Depreciation and Amortization	85	88
Allowance for equity funds	(2)	(2)
Deferred income taxes and amortization of investment tax credits	46	37
Increase (Decrease) in Regulatory Assets and Liabilities	9	(14)
Deferred Energy Change	(23)	55
Amortization of Deferred Charges	(43)	(35)
Other Noncash Income (Expense)	0	1
Increase (Decrease) in Accounts Receivable and Other Operating Assets	13	12
Increase (Decrease) in Inventories	(2)	1
Accrued property, income and other taxes	(2)	0
Accounts payable and other liabilities	(54)	(15)
Net cash flows from operating activities	112	191
Capital expenditures	(131)	(137)
Net cash flows from investing activities	(131)	(137)
Proceeds from Issuance of Long-term Debt	0	1,089
Repayments of Long-term Debt	(1)	(1,137)
Payments of Ordinary Dividends, Common Stock	(5)	(45)
Net cash flows from financing activities	(6)	(93)
Net change in cash and cash equivalents	(25)	(39)
Cash and cash equivalents at beginning of period	55	106
Cash and cash equivalents at end of period	$ 30	$ 67