Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Net Income (Loss) Attributable to Parent	$ 2,443	$ 2,286
Allowance for equity funds	(126)	(75)
Changes in regulatory assets and liabilities	108	263
Deferred income taxes and amortization of investment tax credits	(92)	(116)
Other Noncash Income (Expense)	(44)	(40)
Trade receivables and other assets	(594)	(192)
Accrued property, income and other taxes, net	195	190
Accounts payable and other liabilities	109	168
Net cash flows from operating activities	4,660	5,031
Capital expenditures	(4,898)	(4,203)
Net cash flows from investing activities	(6,035)	(4,517)
Other, net	(42)	(32)
Net cash flows from financing activities	1,901	(392)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	523	119
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	1,406	1,402
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	80	76
Depreciation and amortization	94	89
Allowance for equity funds	(2)	(3)
Changes in regulatory assets and liabilities	30	32
Deferred income taxes and amortization of investment tax credits	(5)	9
Deferred Energy Change	7	26
Amortization of Deferred Charges	(5)	(6)
Other Noncash Income (Expense)	3	0
Trade receivables and other assets	(3)	(3)
Increase (Decrease) in Inventories	7	5
Accrued property, income and other taxes, net	10	(2)
Accounts payable and other liabilities	(7)	(5)
Net cash flows from operating activities	189	208
Capital expenditures	(165)	(139)
Proceeds from Sale of Other Property, Plant, and Equipment	1	0
Net cash flows from investing activities	(164)	(139)
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	(3)	(2)
Net cash flows from financing activities	(33)	(2)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(8)	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	$ 68	$ 75