Employee Benefit Plans - Asset Allocations (Details)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Domestic Pension Plans [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Investment Funds Comprised Of Debt Securities		34.00%	39.00%
Percentage of Investment Funds Comprised Of Equity Securitites		66.00%	61.00%
Domestic Other Postretirement Plans [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Investment Funds Comprised Of Debt Securities		37.00%	37.00%
Percentage of Investment Funds Comprised Of Equity Securitites		63.00%	63.00%
UK Pension Plans [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Investment Funds Comprised Of Debt Securities		56.00%
Percentage of Investment Funds Comprised Of Equity Securitites		44.00%
UK Pension Plans [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[1]	50.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	[1]	55.00%
UK Pension Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[1]	35.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	[1]	40.00%
UK Pension Plans [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum		5.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum		15.00%
PacifiCorp [Member] | Domestic Pension Plans [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[2]	33.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	[2]	37.00%
PacifiCorp [Member] | Domestic Pension Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[2]	53.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	[2]	57.00%
PacifiCorp [Member] | Domestic Pension Plans [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum		8.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum		12.00%
PacifiCorp [Member] | Domestic Pension Plans [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum		0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum		1.00%
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[2]	33.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	[2]	37.00%
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[2]	61.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	[2]	65.00%
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum		1.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum		3.00%
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum		0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum		1.00%
MidAmerican Energy Company [Member] | Domestic Pension Plans [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[2]	20.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	[2]	40.00%
MidAmerican Energy Company [Member] | Domestic Pension Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[2]	60.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	[2]	80.00%
MidAmerican Energy Company [Member] | Domestic Pension Plans [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum		2.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum		8.00%
MidAmerican Energy Company [Member] | Domestic Pension Plans [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum		0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum		5.00%
MidAmerican Energy Company [Member] | Domestic Other Postretirement Plans [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[2]	25.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	[2]	45.00%
MidAmerican Energy Company [Member] | Domestic Other Postretirement Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[2]	50.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	[2]	80.00%
MidAmerican Energy Company [Member] | Domestic Other Postretirement Plans [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum		0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum		0.00%
MidAmerican Energy Company [Member] | Domestic Other Postretirement Plans [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum		0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum		5.00%
NV Energy, Inc. [Member] | Domestic Pension Plans [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[2]	53.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	[2]	77.00%
NV Energy, Inc. [Member] | Domestic Pension Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[2]	23.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	[2]	47.00%
NV Energy, Inc. [Member] | Domestic Other Postretirement Plans [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[2]	4000.00%
NV Energy, Inc. [Member] | Domestic Other Postretirement Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[2]	6000.00%

[1] For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds have been allocated based on the underlying investments in debt and equity securities.

[2] For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.