Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Net Income (Loss) Attributable to Parent	$ 885	$ 1,130
Allowance for equity funds	(45)	(35)
Deferred income taxes and amortization of investment tax credits	(264)	341
Changes in regulatory assets and liabilities	206	21
Other Noncash Income (Expense)	(26)	(8)
Trade receivables and other assets	(226)	(73)
Accrued property, income and other taxes, net	174	(244)
Accounts payable and other liabilities	16	20
Net cash flows from operating activities	2,818	2,428
Capital expenditures	(2,779)	(1,813)
Net cash flows from investing activities	(3,019)	(2,481)
Repayments of BHE senior debt and junior subordinated debentures	(650)	(950)
Net cash flows from financing activities	465	112
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	261	62
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,283	1,003
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,544	1,065
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	41	41
Utilities Operating Expense, Depreciation and Amortization	59	56
Allowance for equity funds	(2)	(1)
Deferred income taxes and amortization of investment tax credits	2	23
Changes in regulatory assets and liabilities	19	7
Deferred Energy Change	26	(20)
Amortization of Deferred Charges	(5)	(34)
Other Noncash Income (Expense)	0	1
Trade receivables and other assets	21	23
Accrued property, income and other taxes, net	11	1
Accounts payable and other liabilities	(10)	(54)
Net cash flows from operating activities	162	41
Capital expenditures	(94)	(87)
Net cash flows from investing activities	(94)	(87)
Repayments of BHE senior debt and junior subordinated debentures	(1)	(1)
Payments of Ordinary Dividends, Common Stock	0	(5)
Net cash flows from financing activities	(1)	(6)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	67	(52)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	8	60
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 75	$ 8