Segment Information (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 TheNumberOfReportableSegments	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of Reportable Segments									3
Regulated electric									$ 1,762	$ 1,694	$ 1,662
Regulated gas									824	659	769
Nonregulated energy									817	889	1,070
Total operating revenue	900	826	757	920	834	825	709	874	3,403	3,242	3,501
Total depreciation and amortization									403	392	336
Total operating income	77	130	43	106	58	139	81	92	356	370	429
Total fixed charges									144	138	151
Income tax (benefit) expense									(103)	(99)	(17)
Earnings on common stock	78	145	23	103	60	140	80	74	349	354	318
Total utility construction expenditures									1,026	645	565
Total assets	11,869				11,232				11,869	11,232	10,310
Regulated electric [Member]
Segment Reporting Information [Line Items]
Regulated electric									1,762	1,694	1,662
Total depreciation and amortization									366	356	301
Total operating income									255	270	294
Total fixed charges									129	123	133
Income tax (benefit) expense									(136)	(129)	(61)
Earnings on common stock									292	297	243
Total utility construction expenditures									945	588	505
Total assets	10,532				9,898				10,532	9,898	9,016
Regulated gas [Member]
Segment Reporting Information [Line Items]
Regulated gas									824	659	769
Total depreciation and amortization									37	36	35
Total operating income									74	47	66
Total fixed charges									15	15	18
Income tax (benefit) expense									23	7	16
Earnings on common stock									41	28	36
Total utility construction expenditures									81	57	60
Total assets	1,206				1,202				1,206	1,202	1,159
Nonregulated Energy [Member]
Segment Reporting Information [Line Items]
Nonregulated energy									817	889	1,070
Total operating income									27	53	69
Income tax (benefit) expense									10	23	28
Earnings on common stock									16	29	39
Total assets	$ 131				$ 132				$ 131	$ 132	$ 135