Commitments and Contingencies - PacifiCorp - Commitments Tables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Contractual Obligation [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 141
Operating Leases, Future Minimum Payments, Due in Two Years	122
Operating Leases, Future Minimum Payments, Due in Three Years	101
Operating Leases, Future Minimum Payments, Due in Four Years	87
Operating Leases, Future Minimum Payments, Due in Five Years	73
Operating Leases, Future Minimum Payments, Due Thereafter	1,085
Operating Leases, Future Minimum Payments Due	1,609
Contractual Obligation, Due in Next Twelve Months	3,666
Contractual Obligation, Due in Second Year	1,997
Contractual Obligation, Due in Third Year	1,768
Contractual Obligation, Due in Fourth Year	1,482
Contractual Obligation, Due in Fifth Year	1,264
Contractual Obligation, Due after Fifth Year	11,865
Contractual Obligation	22,042
Capital Addition Purchase Commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	852
Purchase Obligation, Due in Second Year	49
Purchase Obligation, Due in Third Year	66
Purchase Obligation, Due in Fourth Year	1
Purchase Obligation, Due in Fifth Year	1
Purchase Obligation, Due after Fifth Year	4
Purchase Obligation	973
Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	303
Purchase Obligation, Due in Second Year	220
Purchase Obligation, Due in Third Year	212
Purchase Obligation, Due in Fourth Year	186
Purchase Obligation, Due in Fifth Year	180
Purchase Obligation, Due after Fifth Year	723
Purchase Obligation	1,824
PacifiCorp [Member]
Contractual Obligation [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	5
Operating Leases, Future Minimum Payments, Due in Two Years	5
Operating Leases, Future Minimum Payments, Due in Three Years	5
Operating Leases, Future Minimum Payments, Due in Four Years	5
Operating Leases, Future Minimum Payments, Due in Five Years	4
Operating Leases, Future Minimum Payments, Due Thereafter	39
Operating Leases, Future Minimum Payments Due	63
Contractual Obligation, Due in Next Twelve Months	1,288
Contractual Obligation, Due in Second Year	975
Contractual Obligation, Due in Third Year	922
Contractual Obligation, Due in Fourth Year	768
Contractual Obligation, Due in Fifth Year	581
Contractual Obligation, Due after Fifth Year	4,005
Contractual Obligation	8,539
Rent expense for power purchase agreements meeting definition of operating lease	$ 14	$ 13	$ 15
Maximum percentage of energy sources for which a share of operating costs and debt service is required	5.00%	5.00%	5.00%
Operating leases, rent expense, net	$ 15	$ 15	$ 16
PacifiCorp [Member] | Purchased electricity contracts - commercially operable
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	253
Purchase Obligation, Due in Second Year	160
Purchase Obligation, Due in Third Year	157
Purchase Obligation, Due in Fourth Year	157
Purchase Obligation, Due in Fifth Year	145
Purchase Obligation, Due after Fifth Year	1,630
Purchase Obligation	2,502
PacifiCorp [Member] | Purchased electricity contracts - not commercially operable
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	10
Purchase Obligation, Due in Second Year	13
Purchase Obligation, Due in Third Year	17
Purchase Obligation, Due in Fourth Year	17
Purchase Obligation, Due in Fifth Year	18
Purchase Obligation, Due after Fifth Year	390
Purchase Obligation	465
PacifiCorp [Member] | Fuel contracts
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	796
Purchase Obligation, Due in Second Year	616
Purchase Obligation, Due in Third Year	596
Purchase Obligation, Due in Fourth Year	507
Purchase Obligation, Due in Fifth Year	346
Purchase Obligation, Due after Fifth Year	1,407
Purchase Obligation	4,268
PacifiCorp [Member] | Capital Addition Purchase Commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	62
Purchase Obligation, Due in Second Year	46
Purchase Obligation, Due in Third Year	26
Purchase Obligation, Due in Fourth Year	4
Purchase Obligation, Due in Fifth Year	1
Purchase Obligation, Due after Fifth Year	4
Purchase Obligation	143
PacifiCorp [Member] | Transmission
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	109
Purchase Obligation, Due in Second Year	106
Purchase Obligation, Due in Third Year	90
Purchase Obligation, Due in Fourth Year	61
Purchase Obligation, Due in Fifth Year	47
Purchase Obligation, Due after Fifth Year	467
Purchase Obligation	880
PacifiCorp [Member] | Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	53
Purchase Obligation, Due in Second Year	29
Purchase Obligation, Due in Third Year	31
Purchase Obligation, Due in Fourth Year	17
Purchase Obligation, Due in Fifth Year	20
Purchase Obligation, Due after Fifth Year	68
Purchase Obligation	$ 218