Consolidated Statements of Cash Flows - NPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Net Income (Loss) Attributable to Parent	$ 2,286	$ 2,198
Allowance for equity funds	(75)	(59)
Changes in regulatory assets and liabilities	263	17
Deferred income taxes and amortization of investment tax credits	(116)	573
Other Noncash Income (Expense)	40	21
Trade receivables and other assets	(192)	(82)
Accrued property, income and other taxes, net	190	390
Accounts payable and other liabilities	168	170
Net cash flows from operating activities	5,031	5,134
Capital expenditures	(4,203)	(3,179)
Acquisitions, net of cash acquired		(1,102)
Payments for (Proceeds from) Other Investing Activities	(48)	12
Net cash flows from investing activities	(4,517)	(4,354)
Repayments of BHE senior debt and junior subordinated debentures	(650)	(1,344)
Net cash flows from financing activities	(392)	(330)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	119	456
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,283	1,003
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,402	1,459
Nevada Power Company [Member]
Net Income (Loss) Attributable to Parent	228	263
Marketable Securities, Gain (Loss)	(1)	0
Other Nonrecurring (Income) Expense	0	(1)
Depreciation and amortization	253	231
Allowance for equity funds	(2)	(1)
Changes in regulatory assets and liabilities	75	25
Deferred income taxes and amortization of investment tax credits	(7)	61
Deferred Energy Change	12	(22)
Amortization of Deferred Charges	13	13
Other Noncash Income (Expense)	9	(1)
Trade receivables and other assets	(138)	(125)
Increase (Decrease) in Inventories	1	6
Accrued property, income and other taxes, net	54	11
Accounts payable and other liabilities	(11)	9
Net cash flows from operating activities	486	469
Capital expenditures	(203)	(202)
Acquisitions, net of cash acquired	0	(77)
Payments for (Proceeds from) Other Investing Activities	(1)	(4)
Net cash flows from investing activities	(202)	(275)
Proceeds from Issuance of Long-term Debt	573	91
Repayments of BHE senior debt and junior subordinated debentures	(836)	(86)
Payments of Ordinary Dividends, Common Stock	0	(412)
Net cash flows from financing activities	(263)	(407)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	21	(213)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	66	290
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 87	$ 77