Components of Accumulated Other Comprehensive Loss, Net - MEC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of accumulated other comprehensive income (loss)
Beginning balance	$ (494)
Unrealized gains (losses) on available-for-sale securities, net of tax	225	$ (134)	$ 263
Unrealized (losses) gains on cash flow hedges, net of tax	(11)	(18)	13
Other comprehensive (loss) income, net of tax	(414)	(397)	366
Ending balance	(908)	(494)
MidAmerican Energy Company [Member]
Schedule of accumulated other comprehensive income (loss)
Beginning balance	(23)
Unrealized gains (losses) on available-for-sale securities, net of tax	0	1	1
Unrealized (losses) gains on cash flow hedges, net of tax	(7)	(13)	12
Other comprehensive (loss) income, net of tax	(7)	(12)	13
Ending balance	(30)	(23)
Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of accumulated other comprehensive income (loss)
Beginning balance	390	524	261
Beginning balance	18	36	23
Beginning balance	(494)	(97)	(463)
Unrealized gains (losses) on available-for-sale securities, net of tax	225	(134)	263
Unrealized (losses) gains on cash flow hedges, net of tax	(11)	(18)	13
Other comprehensive (loss) income, net of tax	(414)	(397)	366
Ending balance	615	390	524
Ending balance	7	18	36
Ending balance	(908)	(494)	(97)
Accumulated Other Comprehensive Income (Loss) [Member] | MidAmerican Energy Company [Member]
Schedule of accumulated other comprehensive income (loss)
Beginning balance	(3)	(4)
Beginning balance	(20)	(7)
Beginning balance	(23)	(11)
Unrealized gains (losses) on available-for-sale securities, net of tax	0	1
Unrealized (losses) gains on cash flow hedges, net of tax	(7)	(13)
Other comprehensive (loss) income, net of tax	(7)	(12)	13
Ending balance	(3)	(3)	(4)
Ending balance	(27)	(20)	(7)
Ending balance	$ (30)	$ (23)	$ (11)