Unaudited Quarterly Operating Results (MEC) (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
MidAmerican Energy Company [Member]
Unaudited Quarterly Operating Results [Line Items]
Operating revenue	$ 900	$ 826	$ 757	$ 920	$ 834	$ 825	$ 709	$ 874	$ 3,403	$ 3,242	$ 3,501
Operating income	77	130	43	106	58	139	81	92	356	370	429
Net income	78	145	24	103	60	140	81	74	350	355	319
Earnings on common stock	78	145	23	103	60	140	80	74	349	354	318
Income tax benefits from tax method change							$ 16