Consolidated Statements of Cash Flows - NPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net Income (Loss) Attributable to Parent	$ 4	$ 670
Allowance for equity funds	(26)	(34)
Changes in regulatory assets and liabilities	(9)	0
Deferred income taxes and amortization of investment tax credits	(135)	47
Other Noncash Income (Expense)	9	63
Trade receivables and other assets	(249)	(118)
Accrued property, income and other taxes, net	(453)	(364)
Accounts payable and other liabilities	19	117
Net cash flows from operating activities	1,525	1,165
Capital expenditures	(1,295)	(1,356)
Net cash flows from investing activities	(1,374)	(1,474)
Other, net	(9)	(32)
Net cash flows from financing activities	(191)	1,358
Net change in cash and cash equivalents and restricted cash and cash equivalents	(39)	1,036
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,445	1,268
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,406	2,304
Nevada Power Company [Member]
Net Income (Loss) Attributable to Parent	2	(4)
Depreciation and amortization	101	90
Allowance for equity funds	(1)	(2)
Changes in regulatory assets and liabilities	(15)	3
Deferred income taxes and amortization of investment tax credits	(10)	(4)
Deferred Energy Change	41	4
Other Noncash Income (Expense)	(1)	8
Trade receivables and other assets	41	32
Increase (Decrease) in Inventories	4	(1)
Accrued property, income and other taxes, net	3	(6)
Accounts payable and other liabilities	14	(41)
Net cash flows from operating activities	179	79
Capital expenditures	(106)	(111)
Net cash flows from investing activities	(106)	(111)
Proceeds from long-term debt	0	719
Repayments of BHE senior debt and junior subordinated debentures	0	(575)
Other, net	(5)	(4)
Net cash flows from financing activities	(5)	140
Net change in cash and cash equivalents and restricted cash and cash equivalents	68	108
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	36	25
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 104	$ 133