Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended				9 Months Ended	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income						$ 2,591	$ 2,910	$ 2,570
Net income (loss) attributable to parent						2,568	2,870	2,542
Adjustments to reconcile net income to net cash flows from operating activities:
Gain (Loss) on Investments						538	(14)	(10)
Other Nonrecurring (Income) Expense						56	455	62
Depreciation and amortization						2,984	2,646	2,591
Deferred income taxes and amortization of investment tax credits						8	19	1,090
Allowance for equity funds						(104)	(76)	(158)
Equity (income) loss, net of distributions						(43)	151	(123)
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions						45	260	(67)
Changes in regulatory assets and liabilities						196	31	(34)
Other, net						67	12	(132)
Increase (Decrease) in Accounts Receivable and Other Operating Assets						(72)	74	110
Changes in other operating assets and liabilities, net of effects from acquisitions:
Derivative collateral, net						27	(22)	32
Pension and other postretirement benefit plans						(54)	(91)	(79)
Accrued property, income and other taxes						199	(28)	377
Accounts payable and other liabilities						145	50	(28)
Net cash flows from operating activities						6,770	6,078	6,104
Cash flows from investing activities:
Capital expenditures						(6,241)	(4,571)	(5,090)
Acquisitions, net of cash acquired						(106)	(1,113)	(66)
Purchases of marketable securities						(329)	(190)	(141)
Proceeds from sales of marketable securities						287	202	191
Equity method investments						(683)	(395)	(596)
Other, net						83	(12)	(34)
Net cash flows from investing activities						(6,989)	(6,079)	(5,736)
Cash flows from financing activities:
Proceeds from BHE senior debt						3,166	0	0
Repayments of BHE senior debt and junior subordinated debentures						(1,045)	(2,323)	(2,000)
Payments for Repurchase of Common Stock						(107)	(19)	0
Proceeds from subsidiary debt						2,352	1,763	2,327
Repayments of subsidiary debt						(2,422)	(1,000)	(1,831)
Net proceeds from (repayments of) short-term debt						(1,946)	2,361	879
Payment for Debt Extinguishment or Debt Prepayment Cost						0	(435)	0
Business acquisition, acquisition of remaining noncontrolling interest						(131)	0	0
Other, net						(41)	(73)	(65)
Net cash flows from financing activities						(174)	274	(690)
Effect of exchange rate changes						(7)	7	(7)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect						(400)	280	(329)
Cash and cash equivalents and restricted cash and cash equivalents at end of period		$ 1,283		$ 1,003	$ 1,003	1,283	1,003	1,332
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 883		$ 1,283			883	1,283	1,003	$ 1,332
Parent Company [Member]
Cash flows from operating activities:
Net income						2,571	2,873	2,545
Net income (loss) attributable to parent						2,568	2,870	2,542
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization						4	4	4
Equity (income) loss, net of distributions						(3,058)	(3,441)	(2,805)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Net cash flows from operating activities						1,885	2,450	2,760
Cash flows from investing activities:
Investments in subsidiaries						1,791	1,566	1,080
Purchases of marketable securities						(44)	(71)	(24)
Proceeds from sales of marketable securities						45	68	20
Repayment of (Issuance of) Notes Receivable with Related Parties, Net						(72)	(305)	(307)
Other, net						(22)	(8)	(5)
Net cash flows from investing activities						(1,884)	(1,882)	(1,396)
Cash flows from financing activities:
Proceeds from BHE senior debt						3,166	0	0
Payments for Repurchase of Common Stock						(107)	(19)	0
Net proceeds from (repayments of) short-term debt						(2,348)	2,498	581
Payment for Debt Extinguishment or Debt Prepayment Cost						0	(406)	0
Notes payable to affiliate, net						0	0	69
Other, net						(4)	(5)	(4)
Net cash flows from financing activities						(338)	(255)	(1,354)
Net change in cash and cash equivalents and restricted cash and cash equivalents						(337)	313	10
MidAmerican Energy Company [Member]
Cash flows from operating activities:
Net income (loss) attributable to parent	(13)	106	(19)	105		682	605	542
Adjustments to reconcile net income to net cash flows from operating activities:
Utilities Operating Expense, Depreciation and Amortization						609	500	479
Amortization of Utility Plant to Other Operating Expense						34	34	37
Deferred income taxes and amortization of investment tax credits						33	332	361
Allowance for equity funds						(53)	(41)	(19)
Other, net						13	(15)	(62)
Increase (Decrease) in Accounts Receivable and Other Operating Assets						25	60	60
Changes in other operating assets and liabilities, net of effects from acquisitions:
Derivative collateral, net						(1)	2	5
Increase (Decrease) in Inventories						41	19	(27)
Pension and other postretirement benefit plans						(13)	(11)	(6)
Accrued property, income and other taxes						218	(41)	107
Accounts payable and other liabilities						(30)	72	46
Net cash flows from operating activities						1,508	1,396	1,403
Cash flows from investing activities:
Capital expenditures						(2,332)	(1,773)	(1,636)
Purchases of marketable securities						(263)	(143)	(138)
Proceeds from sales of marketable securities						223	137	158
Proceeds from Sales of Business, Affiliate and Productive Assets						17	2	0
Increase (Decrease) in Restricted Cash and Investments						(15)	(1)	0
Other, net						30	0	11
Net cash flows from investing activities						(2,310)	(1,776)	(1,605)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt						687	990	62
Net proceeds from (repayments of) short-term debt						240	(99)	99
Repayments of Long-term Debt						(350)	(255)	(38)
Other, net						(1)	0	0
Net cash flows from financing activities						576	636	123
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect						(226)	256	(79)
Cash and cash equivalents and restricted cash and cash equivalents at end of period		282		26	26	282	26	105
Cash and cash equivalents and restricted cash and cash equivalents at end of period	56		282			56	282	26	105
PacifiCorp [Member]
Cash flows from operating activities:
Net income (loss) attributable to parent						738	768	763	695
Adjustments to reconcile net income to net cash flows from operating activities:
Utilities Operating Expense, Depreciation and Amortization						979	796	770
Deferred income taxes and amortization of investment tax credits						(199)	70	139
Allowance for equity funds						(35)	(20)	(27)
Changes in regulatory assets and liabilities						87	18	122
Other, net						5	9	4
Increase (Decrease) in Accounts Receivable and Other Operating Assets						(31)	(75)	(6)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Derivative collateral, net						15	(6)	6
Increase (Decrease) in Inventories						16	10	(21)
Increase (Decrease) in Prepaid Expense						31	(8)	(5)
Accrued property, income and other taxes						60	(48)	0
Accounts payable and other liabilities						83	(62)	(163)
Net cash flows from operating activities						1,811	1,602	1,594
Cash flows from investing activities:
Capital expenditures						(1,257)	(769)	(903)
Other, net						5	12	8
Net cash flows from investing activities						(1,252)	(757)	(895)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt						593	0	0
Net proceeds from (repayments of) short-term debt						(50)	(190)	250
Repayments of long-term debt and capital lease obligations (PacifiCorp)						(588)	(58)	(68)
Common stock dividends						(450)	(600)	(875)
Other, net						(1)	(1)	(1)
Net cash flows from financing activities						(496)	(849)	(694)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect						63	(4)	5
Cash and cash equivalents and restricted cash and cash equivalents at end of period		29		33	33	29	33	28
Cash and cash equivalents and restricted cash and cash equivalents at end of period	92		29			92	29	33	28
MidAmerican Funding, LLC and Subsidiaries [Domain]
Cash flows from operating activities:
Net income (loss) attributable to parent	(16)	103	(42)	102	383	669	574	532
Adjustments to reconcile net income to net cash flows from operating activities:
Other Nonrecurring (Income) Expense						0	29	0
Utilities Operating Expense, Depreciation and Amortization						609	500	479
Amortization of Utility Plant to Other Operating Expense						34	34	37
Deferred income taxes and amortization of investment tax credits						32	334	362
Allowance for equity funds						(53)	(41)	(19)
Other, net						16	(14)	(63)
Increase (Decrease) in Accounts Receivable and Other Operating Assets						19	62	60
Changes in other operating assets and liabilities, net of effects from acquisitions:
Derivative collateral, net						(1)	2	5
Increase (Decrease) in Inventories						41	19	(27)
Pension and other postretirement benefit plans						(13)	(11)	(6)
Accrued property, income and other taxes						230	(54)	107
Accounts payable and other liabilities						(29)	70	46
Net cash flows from operating activities						1,516	1,380	1,393
Cash flows from investing activities:
Capital expenditures						(2,332)	(1,773)	(1,636)
Purchases of marketable securities						(263)	(143)	(138)
Proceeds from sales of marketable securities						223	137	158
Proceeds from Sales of Business, Affiliate and Productive Assets						17	2	2
Increase (Decrease) in Restricted Cash and Investments						(15)	(1)	0
Other, net						30	(3)	10
Net cash flows from investing activities						(2,310)	(1,779)	(1,604)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt						687	990	62
Net proceeds from (repayments of) short-term debt						240	(99)	99
Payment for Debt Extinguishment or Debt Prepayment Cost						0	(29)	0
Repayments of Long-term Debt						(350)	(341)	(38)
Increase (Decrease) in Notes Payable, Related Parties, Current						(8)	133	9
Other, net						0	0	1
Net cash flows from financing activities						569	654	133
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect						(225)	255	(78)
Cash and cash equivalents and restricted cash and cash equivalents at end of period		282		27	27	282	27	105
Cash and cash equivalents and restricted cash and cash equivalents at end of period	57		282			57	282	27	105
Nevada Power Company [Member]
Cash flows from operating activities:
Net income (loss) attributable to parent	(2)	0	(8)	10		226	255	279
Adjustments to reconcile net income to net cash flows from operating activities:
Other Nonrecurring (Income) Expense						0	(1)	1
Utilities Operating Expense, Depreciation and Amortization						337	308	303
Deferred income taxes and amortization of investment tax credits						(13)	94	78
Allowance for equity funds						(3)	(1)	(2)
Changes in regulatory assets and liabilities						83	50	131
Deferred Energy Change						(11)	(16)	(21)
Amortization Income (Expense) of Deferred Energy						16	16	(107)
Other, net						14	(3)	0
Increase (Decrease) in Accounts Receivable and Other Operating Assets						(5)	(6)	(26)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Increase (Decrease) in Inventories						(1)	6	7
Accrued property, income and other taxes						(35)	(26)	63
Accounts payable and other liabilities						1	(23)	13
Net cash flows from operating activities						619	665	771
Cash flows from investing activities:
Capital expenditures						(298)	(270)	(335)
Payments for Previous Acquisition						0	(77)	0
Proceeds from Sale of Other Property, Plant, and Equipment						1	4	0
Net cash flows from investing activities						(297)	(343)	(335)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt						573	91	0
Repayments of Long-term Debt						(840)	(89)	(224)
Common stock dividends						0	(548)	(469)
Net cash flows from financing activities						(267)	(546)	(693)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect						55	(224)	(257)
Cash and cash equivalents and restricted cash and cash equivalents at end of period		66		290	290	66	290	547
Cash and cash equivalents and restricted cash and cash equivalents at end of period	121		66			121	66	290	547
Sierra Pacific Power Company [Member]
Cash flows from operating activities:
Net income (loss) attributable to parent						92	109	84
Adjustments to reconcile net income to net cash flows from operating activities:
Other Nonrecurring (Income) Expense						0	0	5
Utilities Operating Expense, Depreciation and Amortization						119	114	118
Deferred income taxes and amortization of investment tax credits						7	55	49
Allowance for equity funds						(4)	(4)	1
Changes in regulatory assets and liabilities						42	17	(17)
Deferred Energy Change						9	(20)	53
Amortization Income (Expense) of Deferred Energy						(10)	(47)	(54)
Other, net						0	(4)	0
Increase (Decrease) in Accounts Receivable and Other Operating Assets						(3)	(4)	(7)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Increase (Decrease) in Inventories						(4)	(3)	(6)
Accrued property, income and other taxes						3	1	(3)
Accounts payable and other liabilities						18	(41)	6
Net cash flows from operating activities						275	181	243
Cash flows from investing activities:
Capital expenditures						(205)	(186)	(194)
Net cash flows from investing activities						(205)	(186)	(194)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt						0	0	1,089
Repayments of Long-term Debt						(2)	(2)	(1,138)
Common stock dividends						0	(45)	(51)
Net cash flows from financing activities						(2)	(47)	(100)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect						68	(52)	(51)
Cash and cash equivalents and restricted cash and cash equivalents at end of period		$ 8		$ 60	$ 60	8	60	111
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 76		$ 8			$ 76	$ 8	$ 60	$ 111