Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	PacifiCorp [Member]	PacifiCorp [Member] Preferred Stock [Member]	PacifiCorp [Member] Common Stock [Member]	PacifiCorp [Member] Additional Paid-in Capital [Member]	PacifiCorp [Member] Retained Earnings [Member]	PacifiCorp [Member] Accumulated Other Comprehensive Income (Loss) [Member]	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member] Common Stock [Member]	MidAmerican Energy Company [Member] Retained Earnings [Member]	MidAmerican Energy Company [Member] Accumulated Other Comprehensive Income (Loss) [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain]	MidAmerican Funding, LLC and Subsidiaries [Domain] Additional Paid-in Capital [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain] Retained Earnings [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain] Accumulated Other Comprehensive Income (Loss) [Member]	Sierra Pacific Power Company [Member]	Sierra Pacific Power Company [Member] Common Stock [Member]	Sierra Pacific Power Company [Member] Additional Paid-in Capital [Member]	Sierra Pacific Power Company [Member] Retained Earnings [Member]	Sierra Pacific Power Company [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Nevada Power Company [Member]	Nevada Power Company [Member] Common Stock [Member]	Nevada Power Company [Member] Additional Paid-in Capital [Member]	Nevada Power Company [Member] Retained Earnings [Member]	Nevada Power Company [Member] Accumulated Other Comprehensive Income (Loss) [Member]
Balance (shares) at Dec. 31, 2014		77,000,000																				1,000					1,000
Balance at Dec. 31, 2014	$ 20,573	$ 0	$ 6,423	$ 14,513	$ (494)	$ 131
Balance at Dec. 31, 2014							$ 7,756	$ 2	$ 0	$ 4,479	$ 3,288	$ (13)	$ 4,250	$ 561	$ 3,712	$ (23)	$ 5,073	$ 1,679	$ 3,417	$ (23)	$ 998	$ 0	$ 1,111	$ (111)	$ (2)	$ 2,888	$ 0	$ 2,308	$ 583	$ (3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,388	0	0	2,370	0	18
Net income	2,400
Net income (loss) attributable to parent	2,370						695		0	0	695	0	462		462		458		458		83			83		288			288
Other comprehensive income (loss)	(414)	0	0	0	(414)	0	2		0	0	0	2	(7)			(7)	(7)			(7)
Dividend, noncash, transfer of operations													0				0
Distributions	(21)	0	0	0	0	(21)
Common stock dividends declared							(950)		0	0	(950)	0									(7)			(7)		(13)			(13)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	67			56		11
Common stock, value, repurchased	(36)	0	(3)	(33)	0	0
Other equity transactions	(22)	$ 0	(17)	0	0	(5)											1		1		2				2
Balance (shares) at Dec. 31, 2015		77,000,000																				1,000					1,000
Balance at Dec. 31, 2015	22,535	$ 0	6,403	16,906	(908)	134
Balance at Dec. 31, 2015							7,503	2	0	4,479	3,033	(11)	4,705	$ 561	4,174	(30)	5,525	1,679	3,876	(30)	1,076	$ 0	1,111	(35)	0	3,163	$ 0	2,308	858	(3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,556	0	0	2,542	0	14
Net income	2,570
Net income (loss) attributable to parent	2,542						763		0	0	763	0	542		542		532		532		84			84		279			279
Other comprehensive income (loss)	(603)	0	0	0	(603)	0	(1)		0	0	0	(1)	3			3	3			3
Stockholders' equity transfer to affiliate																	27			27
Dividend, noncash, transfer of operations													(90)		(117)	(27)	(90)
Distributions	(20)	0	0	0	0	(20)
Common stock dividends declared							$ (875)		0	0	(875)	0									(51)			(51)		(469)			(469)
Other equity transactions	$ (5)	$ 0	(13)	0	0	8											1		1		$ (1)				(1)	$ (1)			(1)
Balance (shares) at Dec. 31, 2016	77,000,000	77,000,000					357,000,000							70,980,203							1,000	1,000				1,000	1,000
Balance at Dec. 31, 2016	$ 24,463	$ 0	6,390	19,448	(1,511)	136
Balance at Dec. 31, 2016	24,327						$ 7,390	2	0	4,479	2,921	(12)	5,160	$ 561	4,599	0	6,086	1,679	4,407	0	$ 1,108	$ 0	1,111	(2)	(1)	$ 2,972	$ 0	2,308	667	(3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,892	0	0	2,870	0	22
Net income	2,910
Net income (loss) attributable to parent	2,870						768		0	0	768	0	605		605		574		574		109			109		255			255
Other comprehensive income (loss)	1,113	0	0	0	1,113	0	(3)		0	0	0	(3)	0				0
Dividend, noncash, transfer of operations													0				0
Distributions	(22)	0	0	0	0	(22)
Common stock dividends declared							$ (600)		0	0	(600)	0									$ (45)			(45)		(548)			(548)
Common stock, value, repurchased	(19)	0	(1)	(18)	0	0
Conversion of Stock, Amount Converted	(100)	0	(6)	(94)	0	0
Other equity transactions	$ (19)	$ 0	(15)	0	0	(4)							1	$ 0	1	0										$ (1)				(1)
Balance (shares) at Dec. 31, 2017	77,000,000	77,000,000					357,000,000							70,980,203							1,000	1,000				1,000	1,000
Balance at Dec. 31, 2017	$ 28,308	$ 0	$ 6,368	$ 22,206	$ (398)	$ 132
Balance at Dec. 31, 2017	$ 28,176						$ 7,555	$ 2	$ 0	$ 4,479	$ 3,089	$ (15)	$ 5,764	$ 561	$ 5,203	$ 0	$ 6,660	$ 1,679	$ 4,981	$ 0	$ 1,172	$ 0	$ 1,111	$ 62	$ (1)	$ 2,678	$ 0	$ 2,308	$ 374	$ (4)