Employee Benefit Plans - PacifiCorp - Contributions and Benefit Payments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	$ 34
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	221
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	224
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	226
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	224
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	225
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	1,054
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	1
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	58
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	58
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	61
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	272
PacifiCorp [Member] | Domestic Pension 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	108
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	110
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	108
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	109
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	107
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	448
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	28
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	27
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	30
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	$ 122