Commitments and Contingencies - PacifiCorp - Commitments Tables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Contractual Obligation [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 197
Operating Leases, Future Minimum Payments, Due in Two Years	177
Operating Leases, Future Minimum Payments, Due in Three Years	160
Operating Leases, Future Minimum Payments, Due in Four Years	139
Operating Leases, Future Minimum Payments, Due in Five Years	111
Operating Leases, Future Minimum Payments, Due Thereafter	1,738
Operating Leases, Future Minimum Payments Due	2,522
Contractual Obligation, Due in Next Twelve Months	5,048
Contractual Obligation, Due in Second Year	2,767
Contractual Obligation, Due in Third Year	1,895
Contractual Obligation, Due in Fourth Year	1,590
Contractual Obligation, Due in Fifth Year	1,399
Contractual Obligation, Due after Fifth Year	14,251
Contractual Obligation	26,950
Capital Addition Purchase Commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	2,330
Purchase Obligation, Due in Second Year	587
Purchase Obligation, Due in Third Year	52
Purchase Obligation, Due in Fourth Year	0
Purchase Obligation, Due in Fifth Year	0
Purchase Obligation, Due after Fifth Year	0
Purchase Obligation	2,969
Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	306
Purchase Obligation, Due in Second Year	344
Purchase Obligation, Due in Third Year	303
Purchase Obligation, Due in Fourth Year	277
Purchase Obligation, Due in Fifth Year	241
Purchase Obligation, Due after Fifth Year	1,358
Purchase Obligation	2,829
PacifiCorp [Member]
Contractual Obligation [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	7
Operating Leases, Future Minimum Payments, Due in Two Years	6
Operating Leases, Future Minimum Payments, Due in Three Years	7
Operating Leases, Future Minimum Payments, Due in Four Years	6
Operating Leases, Future Minimum Payments, Due in Five Years	5
Operating Leases, Future Minimum Payments, Due Thereafter	90
Operating Leases, Future Minimum Payments Due	121
Contractual Obligation, Due in Next Twelve Months	2,117
Contractual Obligation, Due in Second Year	1,548
Contractual Obligation, Due in Third Year	839
Contractual Obligation, Due in Fourth Year	618
Contractual Obligation, Due in Fifth Year	538
Contractual Obligation, Due after Fifth Year	3,893
Contractual Obligation	9,553
Rent expense for power purchase agreements meeting definition of operating lease	$ 26	$ 14
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
PacifiCorp [Member] | Purchased electricity contracts - commercially operable
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	317
Purchase Obligation, Due in Second Year	194
Purchase Obligation, Due in Third Year	155
Purchase Obligation, Due in Fourth Year	152
Purchase Obligation, Due in Fifth Year	145
Purchase Obligation, Due after Fifth Year	1,522
Purchase Obligation	2,485
PacifiCorp [Member] | Purchased electricity contracts - not commercially operable
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	13
Purchase Obligation, Due in Second Year	21
Purchase Obligation, Due in Third Year	48
Purchase Obligation, Due in Fourth Year	49
Purchase Obligation, Due in Fifth Year	49
Purchase Obligation, Due after Fifth Year	797
Purchase Obligation	977
PacifiCorp [Member] | Fuel contracts
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	732
Purchase Obligation, Due in Second Year	648
Purchase Obligation, Due in Third Year	521
Purchase Obligation, Due in Fourth Year	326
Purchase Obligation, Due in Fifth Year	268
Purchase Obligation, Due after Fifth Year	976
Purchase Obligation	3,471
PacifiCorp [Member] | Capital Addition Purchase Commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	888
Purchase Obligation, Due in Second Year	559
Purchase Obligation, Due in Third Year	2
Purchase Obligation, Due in Fourth Year	0
Purchase Obligation, Due in Fifth Year	0
Purchase Obligation, Due after Fifth Year	0
Purchase Obligation	1,449
PacifiCorp [Member] | Transmission
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	108
Purchase Obligation, Due in Second Year	95
Purchase Obligation, Due in Third Year	80
Purchase Obligation, Due in Fourth Year	69
Purchase Obligation, Due in Fifth Year	63
Purchase Obligation, Due after Fifth Year	427
Purchase Obligation	842
PacifiCorp [Member] | Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	52
Purchase Obligation, Due in Second Year	25
Purchase Obligation, Due in Third Year	26
Purchase Obligation, Due in Fourth Year	16
Purchase Obligation, Due in Fifth Year	8
Purchase Obligation, Due after Fifth Year	81
Purchase Obligation	$ 208