Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 2,910	$ 2,570	$ 2,400
Net income (loss) attributable to parent	2,870	2,542	2,370
Other comprehensive income (loss), net of tax:
Unrecognized amounts on retirement benefits, net of tax	64	(9)	52
Foreign currency translation adjustment	546	(583)	(680)
Unrealized gains (losses) on available-for-sale securities, net of tax	500	(30)	225
Unrealized (losses) gains on cash flow hedges, net of tax	3	19	(11)
Total other comprehensive income (loss), net of tax	1,113	(603)	(414)
Comprehensive income	4,023	1,967	1,986
Comprehensive income attributable to noncontrolling interests	40	28	30
Comprehensive income attributable to shareholders	3,983	1,939	1,956
Parent Company [Member]
Net income	2,873	2,545	2,373
Net income (loss) attributable to parent	2,870	2,542	2,370
Other comprehensive income (loss), net of tax:
Total other comprehensive income (loss), net of tax	1,113	(603)	(414)
Comprehensive income	3,986	1,942	1,959
Comprehensive income attributable to noncontrolling interests	3	3	3
Comprehensive income attributable to shareholders	3,983	1,939	1,956
Nevada Power Company [Member]
Net income (loss) attributable to parent	255	279	288
PacifiCorp [Member]
Net income (loss) attributable to parent	768	763	695
Other comprehensive income (loss), net of tax:
Unrecognized amounts on retirement benefits, net of tax	(3)	(1)	2
Total other comprehensive income (loss), net of tax	(3)	(1)	2
Comprehensive income attributable to shareholders	765	762	697
MidAmerican Energy Company [Member]
Net income (loss) attributable to parent	605	542	462
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on available-for-sale securities, net of tax	0	3	0
Unrealized (losses) gains on cash flow hedges, net of tax	0	0	(7)
Total other comprehensive income (loss), net of tax	0	3	(7)
Comprehensive income attributable to shareholders	605	545	455
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net income (loss) attributable to parent	574	532	458
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on available-for-sale securities, net of tax	0	3	0
Unrealized (losses) gains on cash flow hedges, net of tax	0	0	(7)
Total other comprehensive income (loss), net of tax	0	3	(7)
Comprehensive income attributable to shareholders	$ 574	$ 535	$ 451