Employee Benefit Plans (MEC) Fair Value Measurements (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 722		$ 643		$ 555
United States Pension Plans of US Entity, Defined Benefit [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	330	[1]	257	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	361	[1]	360	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	31	[1]	26	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	10		7
United States Pension Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	10	[1]	7	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	10		19
United States Pension Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	10	[1]	19	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	30		31
United States Pension Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	30	[1]	31	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	5		5
United States Pension Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	5	[1]	5	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	31		29
United States Pension Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	31	[1]	29	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | United States companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	163		137
United States Pension Plans of US Entity, Defined Benefit [Member] | United States companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	163	[1]	137	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | United States companies [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | United States companies [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | International companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	52
United States Pension Plans of US Entity, Defined Benefit [Member] | International companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	52	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | International companies [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | International companies [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	390	[2]	389	[2]
Percentage of Investment Funds Comprised Of Equity Securitites	78.00%		74.00%
Percentage of Investment Funds Comprised Of Debt Securities	22.00%		26.00%
Percentage Of Investment Funds Invested in United States Securities	80.00%		77.00%
Percentage Of Investment Funds Invested In International Securities	20.00%		23.00%
United States Pension Plans of US Entity, Defined Benefit [Member] | Investment funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	105	[1],[2]	101	[1],[2]
United States Pension Plans of US Entity, Defined Benefit [Member] | Investment funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	285	[1],[2]	288	[1],[2]
United States Pension Plans of US Entity, Defined Benefit [Member] | Investment funds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1],[2]	0	[1],[2]
United States Pension Plans of US Entity, Defined Benefit [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	31		26
United States Pension Plans of US Entity, Defined Benefit [Member] | Real Estate Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Real Estate Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Real Estate Funds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	31	[1]	26	[1]	24	17
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	256		226		213
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	197		171
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	59		55
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1		2
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1	[1]	2	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	7		4
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	7	[1]	4	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	9		9
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	9	[1]	9	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	37		32
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	37	[1]	32	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	13		14
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	13	[1]	14	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	125		102
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	125	[1]	102	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States companies [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States companies [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	64	[3]	63	[3]
Percentage of Investment Funds Comprised Of Equity Securitites	86.00%		86.00%
Percentage of Investment Funds Comprised Of Debt Securities	14.00%		14.00%
Percentage Of Investment Funds Invested in United States Securities	43.00%		51.00%
Percentage Of Investment Funds Invested In International Securities	57.00%		49.00%
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Investment funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	64	[1],[3]	63	[1],[3]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Investment funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1],[3]	0	[1],[3]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Investment funds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0	[1],[3]	$ 0	[1],[3]

[1] (1)Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.

[2] (2)Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 78% and 22%, respectively, for 2013 and 74% and 26%, respectively, for 2012. Additionally, these funds are invested in United States and international securities of approximately 80% and 20%, respectively, for 2013 and 77% and 23%, respectively, for 2012.

[3] (2)Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 86% and 14%, respectively, for 2013 and 86% and 14%, respectively, for 2012. Additionally, these funds are invested in United States and international securities of approximately 43% and 57%, respectively, for 2013 and 51% and 49%, respectively, for 2012.