Income Taxes Income Taxes - PacifiCorp - Tax Reform (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%	21.00%	35.00%
Deferred Income Tax Expense (Benefit)			$ 296	$ 14	$ 26
Deferred Tax Liabilities, Net			9,653	$ 9,047
PacifiCorp [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Amortization of Excess Deferred Income Taxes, Amount			$ 91
Effective Income Tax Rate Reconciliation, Amortization of Excess Deferred Income Taxes, Percent			11.00%	17.00%	0.00%
Federal statutory income tax rate			21.00%	21.00%	35.00%
Deferred Income Tax Expense (Benefit)			$ (128)	$ (196)	$ 74
Deferred Tax Liabilities, Net			$ 2,563	$ 2,543
Tax Cuts and Jobs Act of 2017 [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Federal statutory income tax rate			21.00%	21.00%
Deferred Income Tax Expense (Benefit)			$ 68
Deferred Tax Liabilities, Net	[1]		7,115
Tax Cuts and Jobs Act of 2017 [Member] | PacifiCorp [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Amortization of Excess Deferred Income Taxes, Amount			$ 127
Tax Cuts and Jobs Act of 2017 [Member] | Deferred Income Tax Charge [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Deferred Income Tax Expense (Benefit)	[1]	$ 1,150

[1] Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.