Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Net Income (Loss) Attributable to Parent	$ 1,130	$ 1,026
Allowance for equity funds	(35)	(130)
Deferred income taxes and amortization of investment tax credits	341	291
Increase (Decrease) in Regulatory Assets and Liabilities	21	(1)
Other Noncash Income (Expense)	(3)	72
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(73)	(252)
Accrued property, income and other taxes	(244)	557
Accounts payable and other liabilities	20	94
Net cash flows from operating activities	2,428	2,771
Capital expenditures	(1,813)	(2,103)
Net cash flows from investing activities	(2,437)	(2,455)
Proceeds from Issuance of Long-term Debt	91	0
Repayments of Long-term Debt	(950)	(1,000)
Other, net	(31)	(39)
Net cash flows from financing activities	112	(642)
Net change in cash and cash equivalents	106	(330)
Cash and cash equivalents at beginning of period	721	1,108
Cash and cash equivalents at end of period	827	778
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	41	27
Utilities Operating Expense, Depreciation and Amortization	56	58
Allowance for equity funds	(1)	(1)
Deferred income taxes and amortization of investment tax credits	23	15
Increase (Decrease) in Regulatory Assets and Liabilities	7	(9)
Deferred Energy Change	(20)	44
Amortization of Deferred Charges	(34)	(21)
Other Noncash Income (Expense)	1	(1)
Increase (Decrease) in Accounts Receivable and Other Operating Assets	24	29
Increase (Decrease) in Inventories	0	(3)
Accrued property, income and other taxes	1	0
Accounts payable and other liabilities	(54)	2
Net cash flows from operating activities	42	142
Capital expenditures	(87)	(92)
Net cash flows from investing activities	(87)	(92)
Proceeds from Issuance of Long-term Debt	0	1,095
Repayments of Long-term Debt	(1)	(1,137)
Payments of Ordinary Dividends, Common Stock	(5)	(40)
Other, net	0	(5)
Net cash flows from financing activities	(6)	(87)
Net change in cash and cash equivalents	(51)	(37)
Cash and cash equivalents at beginning of period	55	106
Cash and cash equivalents at end of period	$ 4	$ 69