Employee Benefit Plans - Asset Allocations (Details)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Other Postretirement Benefits Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Investment Funds Comprised Of Equity Securitites		58.00%	65.00%
Percentage of Investment Funds Comprised Of Debt Securities		42.00%	35.00%
UNITED STATES | Pension Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Investment Funds Comprised Of Equity Securitites		62.00%	59.00%
Percentage of Investment Funds Comprised Of Debt Securities		38.00%	41.00%
UNITED KINGDOM | Pension Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Investment Funds Comprised Of Equity Securitites		38.00%	36.00%
Percentage of Investment Funds Comprised Of Debt Securities		62.00%	64.00%
Minimum [Member] | UNITED KINGDOM | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		.50
Minimum [Member] | UNITED KINGDOM | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		.35
Minimum [Member] | UNITED KINGDOM | Pension Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		.05
Maximum [Member] | UNITED KINGDOM | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		.55
Maximum [Member] | UNITED KINGDOM | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		.40
Maximum [Member] | UNITED KINGDOM | Pension Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		.15
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Investment Funds Comprised Of Equity Securitites		56.00%	59.00%
Percentage of Investment Funds Comprised Of Debt Securities		44.00%	41.00%
PacifiCorp [Member] | UNITED STATES | Pension Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Investment Funds Comprised Of Equity Securitites		55.00%
Percentage of Investment Funds Comprised Of Debt Securities		45.00%
PacifiCorp [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.33
PacifiCorp [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.62
PacifiCorp [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[3]	0.01
PacifiCorp [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.00
PacifiCorp [Member] | Minimum [Member] | UNITED STATES | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.30
PacifiCorp [Member] | Minimum [Member] | UNITED STATES | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.48
PacifiCorp [Member] | Minimum [Member] | UNITED STATES | Pension Plan [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[3]	0.06
PacifiCorp [Member] | Minimum [Member] | UNITED STATES | Pension Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.00
PacifiCorp [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.37
PacifiCorp [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.66
PacifiCorp [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[3]	0.03
PacifiCorp [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.00
PacifiCorp [Member] | Maximum [Member] | UNITED STATES | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.43
PacifiCorp [Member] | Maximum [Member] | UNITED STATES | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1],[2],[3]	0.65
PacifiCorp [Member] | Maximum [Member] | UNITED STATES | Pension Plan [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[3]	0.12
PacifiCorp [Member] | Maximum [Member] | UNITED STATES | Pension Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.00
MidAmerican Energy Company [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.25
MidAmerican Energy Company [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.45
MidAmerican Energy Company [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.00
MidAmerican Energy Company [Member] | Minimum [Member] | Other Postretirement Benefits Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.00
MidAmerican Energy Company [Member] | Minimum [Member] | UNITED STATES | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.20
MidAmerican Energy Company [Member] | Minimum [Member] | UNITED STATES | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.60
MidAmerican Energy Company [Member] | Minimum [Member] | UNITED STATES | Pension Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.02
MidAmerican Energy Company [Member] | Minimum [Member] | UNITED STATES | Pension Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.00
MidAmerican Energy Company [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.45
MidAmerican Energy Company [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.80
MidAmerican Energy Company [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.00
MidAmerican Energy Company [Member] | Maximum [Member] | Other Postretirement Benefits Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.05
MidAmerican Energy Company [Member] | Maximum [Member] | UNITED STATES | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.50
MidAmerican Energy Company [Member] | Maximum [Member] | UNITED STATES | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.80
MidAmerican Energy Company [Member] | Maximum [Member] | UNITED STATES | Pension Plan [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.08
MidAmerican Energy Company [Member] | Maximum [Member] | UNITED STATES | Pension Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description		0.03
NV Energy, Inc. [Member] | Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[1]	4000.00%
NV Energy, Inc. [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	[1]	6000.00%
NV Energy, Inc. [Member] | Minimum [Member] | UNITED STATES | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.53
NV Energy, Inc. [Member] | Minimum [Member] | UNITED STATES | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.23
NV Energy, Inc. [Member] | Maximum [Member] | UNITED STATES | Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.77
NV Energy, Inc. [Member] | Maximum [Member] | UNITED STATES | Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	[1]	0.47

[1] 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.

[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.

[3] PacifiCorp's Retirement Plan trust includes a separate account that is used to fund benefits for the other postretirement benefit plan. In addition to this separate account, the assets for the other postretirement benefit plan are held in Voluntary Employees' Beneficiary Association ("VEBA") trusts, each of which has its own investment allocation strategies. Target allocations for the other postretirement benefit plan include the separate account of the Retirement Plan trust and the VEBA trusts.