Employee Benefit Plans - PacifiCorp - Contributions and Benefit Payments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	$ 14
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	219
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	226
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	224
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	221
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	214
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	1,002
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	4
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	56
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	57
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	57
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	60
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	57
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	259
PacifiCorp [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	5
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	105
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	109
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	108
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	104
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	97
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	426
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	0
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	28
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	28
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	27
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	30
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	26
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	$ 116