Income Taxes - PacifiCorp - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Income Tax Expense (Benefit) Components [Line Items]
Current Federal Tax Expense (Benefit)	$ (686)	$ (653)	$ (743)
Current State and Local Tax Expense (Benefit)	(9)	(3)	1
Current Income Tax Expense (Benefit)	(591)	(573)	(687)
Deferred Federal Income Tax Expense (Benefit)	165	(76)	1,164
Deferred State and Local Income Tax Expense (Benefit)	(131)	100	(59)
Deferred Income Tax Expense (Benefit)	14	26	1,098
Other Tax Expense (Benefit)	(6)	(7)	(8)
Income tax (benefit) expense	(583)	(554)	403
PacifiCorp [Member]
Schedule of Income Tax Expense (Benefit) Components [Line Items]
Current Federal Tax Expense (Benefit)	164	249	169
Current State and Local Tax Expense (Benefit)	40	41	32
Current Income Tax Expense (Benefit)	204	290	201
Deferred Federal Income Tax Expense (Benefit)	(187)	59	123
Deferred State and Local Income Tax Expense (Benefit)	(9)	15	21
Deferred Income Tax Expense (Benefit)	(196)	74	144
Other Tax Expense (Benefit)	(3)	(4)	(5)
Income tax (benefit) expense	$ 5	$ 360	$ 340