Subsidiary Debt Subsidiary Debt - PacifiCorp - Annual Payment on Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 1,006
Long-term Debt, Maturities, Repayments of Principal in Year Two	3,544
Long-term Debt, Maturities, Repayments of Principal in Year Three	2,099
Long-term Debt, Maturities, Repayments of Principal in Year Four	1,552
Long-term Debt, Maturities, Repayments of Principal in Year Five	823
Long-term Debt, Maturities, Repayments of Principal after Year Five	27,271
Par value	36,295
Long-term Debt	36,116	$ 37,972
PacifiCorp [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months	61
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	590
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	354
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	41
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	426
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	5,667
Total Long-term Debt Maturities and Capital Leases Future Minimum Payments	7,139
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	(41)
Capital Leases, Future Minimum Payments, Interest Included in Payments	(19)
Long-term Debt	7,052	7,114
Total long-term debt and capital lease obligations	7,079	$ 7,146
PacifiCorp [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	52
Long-term Debt, Maturities, Repayments of Principal in Year Two	586
Long-term Debt, Maturities, Repayments of Principal in Year Three	350
Long-term Debt, Maturities, Repayments of Principal in Year Four	38
Long-term Debt, Maturities, Repayments of Principal in Year Five	420
Long-term Debt, Maturities, Repayments of Principal after Year Five	5,647
Par value	7,093
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	(41)
Capital Leases, Future Minimum Payments, Interest Included in Payments	0
Long-term Debt	7,052
PacifiCorp [Member] | Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital Leases, Future Minimum Payments Due, Next Twelve Months	9
Capital Leases, Future Minimum Payments Due in Two Years	4
Capital Leases, Future Minimum Payments Due in Three Years	4
Capital Leases, Future Minimum Payments Due in Four Years	3
Capital Leases, Future Minimum Payments Due in Five Years	6
Capital Leases, Future Minimum Payments Due Thereafter	20
Capital Leases, Future Minimum Payments Due	46
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	0
Capital Leases, Future Minimum Payments, Interest Included in Payments	(19)
Capital Lease Obligations	$ 27