Segment Information (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], 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									827	894	1,072
Total operating revenue	905	828	759	921	836	828	709	874	3,413	3,247	3,503
Total depreciation and amortization									403	392	336
Total operating income	78	130	43	106	58	139	81	91	357	369	428
Total fixed charges									167	162	176
Total income tax (benefit) expense									(110)	(108)	(26)
Total net income attributable to MidAmerican Funding									340	342	304
Total utility construction expenditures									1,026	645	565
Total assets	13,167				12,530				13,167	12,530	11,605
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
Total income tax (benefit) expense									(136)	(129)	(61)
Total net income attributable to MidAmerican Funding									292	297	243
Total utility construction expenditures									945	588	505
Total assets	11,723				11,089				11,723	11,089	10,207
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
Total income tax (benefit) expense									23	7	16
Total net income attributable to MidAmerican Funding									41	28	36
Total utility construction expenditures									81	57	60
Total assets	1,285				1,280				1,285	1,280	1,238
Nonregulated Energy [Member]
Segment Reporting Information [Line Items]
Nonregulated									817	889	1,070
Total operating income									27	53	69
Total income tax (benefit) expense									10	23	28
Total net income attributable to MidAmerican Funding									16	29	39
Total assets	131				132				131	132	135
Other [Member]
Segment Reporting Information [Line Items]
Nonregulated									10	5	2
Total operating income									1	(1)	(1)
Total fixed charges									23	24	25
Total income tax (benefit) expense									(7)	(9)	(9)
Total net income attributable to MidAmerican Funding									(9)	(12)	(14)
Total assets	$ 28				$ 29				$ 28	$ 29	$ 25