Consolidated Statements of Cash Flows - NPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Income (Loss) Attributable to Parent	$ 622	$ 513
Allowance for equity funds	(32)	(21)
Changes in regulatory assets and liabilities	(52)	94
Deferred income taxes and amortization of investment tax credits	(21)	(166)
Other Noncash Income (Expense)	1	19
Trade receivables and other assets	144	250
Accrued property, income and other taxes, net	(48)	(60)
Accounts payable and other liabilities	68	(40)
Net cash flows from operating activities	1,488	1,479
Capital expenditures	(1,393)	(1,075)
Net cash flows from investing activities	(1,415)	(1,223)
Other, net	(21)	(14)
Net cash flows from financing activities	900	336
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	974	593
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	883	1,283
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,857	1,876
Nevada Power Company [Member]
Net Income (Loss) Attributable to Parent	6	0
Depreciation and amortization	89	84
Allowance for equity funds	(1)	(1)
Changes in regulatory assets and liabilities	28	10
Deferred income taxes and amortization of investment tax credits	2	(7)
Deferred Energy Change	(33)	0
Amortization of Deferred Charges	3	3
Other Noncash Income (Expense)	(5)	0
Trade receivables and other assets	48	57
Increase (Decrease) in Inventories	(2)	1
Accrued property, income and other taxes, net	(11)	(1)
Accounts payable and other liabilities	11	(36)
Net cash flows from operating activities	135	110
Capital expenditures	(113)	(64)
Proceeds from Sale of Other Assets, Investing Activities	2	0
Net cash flows from investing activities	(111)	(64)
Proceeds from Issuance of Long-term Debt	495	0
Repayments of BHE senior debt and junior subordinated debentures	(500)	0
Payments of Ordinary Dividends, Common Stock	(75)	0
Other, net	(3)	(5)
Net cash flows from financing activities	(83)	(5)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(59)	41
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	121	66
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 62	$ 107