Commitments and Contingencies - PacifiCorp - Commitments Tables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Contractual Obligation [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 143
Operating Leases, Future Minimum Payments, Due in Two Years	118
Operating Leases, Future Minimum Payments, Due in Three Years	95
Operating Leases, Future Minimum Payments, Due in Four Years	77
Operating Leases, Future Minimum Payments, Due in Five Years	66
Operating Leases, Future Minimum Payments, Due Thereafter	1,007
Operating Leases, Future Minimum Payments Due	1,506
Contractual Obligation, Due in Next Twelve Months	4,082
Contractual Obligation, Due in Second Year	2,167
Contractual Obligation, Due in Third Year	1,631
Contractual Obligation, Due in Fourth Year	1,497
Contractual Obligation, Due in Fifth Year	1,354
Contractual Obligation, Due after Fifth Year	11,311
Contractual Obligation	22,042
Capital Addition Purchase Commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	1,544
Purchase Obligation, Due in Second Year	25
Purchase Obligation, Due in Third Year	11
Purchase Obligation, Due in Fourth Year	3
Purchase Obligation, Due in Fifth Year	3
Purchase Obligation, Due after Fifth Year	5
Purchase Obligation	1,591
Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	181
Purchase Obligation, Due in Second Year	264
Purchase Obligation, Due in Third Year	180
Purchase Obligation, Due in Fourth Year	188
Purchase Obligation, Due in Fifth Year	156
Purchase Obligation, Due after Fifth Year	805
Purchase Obligation	1,774
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	4
Operating Leases, Future Minimum Payments, Due in Three Years	4
Operating Leases, Future Minimum Payments, Due in Four Years	4
Operating Leases, Future Minimum Payments, Due in Five Years	4
Operating Leases, Future Minimum Payments, Due Thereafter	42
Operating Leases, Future Minimum Payments Due	63
Contractual Obligation, Due in Next Twelve Months	1,336
Contractual Obligation, Due in Second Year	1,005
Contractual Obligation, Due in Third Year	856
Contractual Obligation, Due in Fourth Year	819
Contractual Obligation, Due in Fifth Year	740
Contractual Obligation, Due after Fifth Year	4,437
Contractual Obligation	9,193
Rent expense for power purchase agreements meeting definition of operating lease	$ 13	$ 15	$ 24
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	$ 16	$ 16
PacifiCorp [Member] | Purchased electricity contracts - commercially operable
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	168
Purchase Obligation, Due in Second Year	71
Purchase Obligation, Due in Third Year	70
Purchase Obligation, Due in Fourth Year	67
Purchase Obligation, Due in Fifth Year	68
Purchase Obligation, Due after Fifth Year	401
Purchase Obligation	845
PacifiCorp [Member] | Purchased electricity contracts - not commercially operable
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	16
Purchase Obligation, Due in Second Year	102
Purchase Obligation, Due in Third Year	104
Purchase Obligation, Due in Fourth Year	104
Purchase Obligation, Due in Fifth Year	104
Purchase Obligation, Due after Fifth Year	1,687
Purchase Obligation	2,117
PacifiCorp [Member] | Fuel contracts
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	862
Purchase Obligation, Due in Second Year	689
Purchase Obligation, Due in Third Year	558
Purchase Obligation, Due in Fourth Year	542
Purchase Obligation, Due in Fifth Year	496
Purchase Obligation, Due after Fifth Year	1,720
Purchase Obligation	4,867
PacifiCorp [Member] | Capital Addition Purchase Commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	144
Purchase Obligation, Due in Second Year	12
Purchase Obligation, Due in Third Year	10
Purchase Obligation, Due in Fourth Year	2
Purchase Obligation, Due in Fifth Year	2
Purchase Obligation, Due after Fifth Year	5
Purchase Obligation	175
PacifiCorp [Member] | Transmission
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	105
Purchase Obligation, Due in Second Year	97
Purchase Obligation, Due in Third Year	91
Purchase Obligation, Due in Fourth Year	76
Purchase Obligation, Due in Fifth Year	55
Purchase Obligation, Due after Fifth Year	508
Purchase Obligation	932
PacifiCorp [Member] | Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	36
Purchase Obligation, Due in Second Year	30
Purchase Obligation, Due in Third Year	19
Purchase Obligation, Due in Fourth Year	24
Purchase Obligation, Due in Fifth Year	11
Purchase Obligation, Due after Fifth Year	74
Purchase Obligation	$ 194