Subsidiary Debt Subsidiary Debt - PacifiCorp - Annual Payment on Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 1,148
Long-term Debt, Maturities, Repayments of Principal in Year Two	985
Long-term Debt, Maturities, Repayments of Principal in Year Three	3,520
Long-term Debt, Maturities, Repayments of Principal in Year Four	2,070
Long-term Debt, Maturities, Repayments of Principal in Year Five	1,589
Long-term Debt, Maturities, Repayments of Principal after Year Five	28,821
Par value	38,133
Long-term Debt	37,972	$ 38,649
PacifiCorp [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months	71
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	62
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	591
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	355
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	42
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	6,094
Total Long-term Debt Maturities and Capital Leases Future Minimum Payments	7,215
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	(45)
Capital Leases, Future Minimum Payments, Interest Included in Payments	(24)
Long-term Debt	7,114	6,985
Total long-term debt and capital lease obligations	7,146	$ 7,019
PacifiCorp [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	66
Long-term Debt, Maturities, Repayments of Principal in Year Two	52
Long-term Debt, Maturities, Repayments of Principal in Year Three	586
Long-term Debt, Maturities, Repayments of Principal in Year Four	350
Long-term Debt, Maturities, Repayments of Principal in Year Five	38
Long-term Debt, Maturities, Repayments of Principal after Year Five	6,067
Par value	7,159
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	(45)
Capital Leases, Future Minimum Payments, Interest Included in Payments	0
Long-term Debt	7,114
PacifiCorp [Member] | Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital Leases, Future Minimum Payments Due, Next Twelve Months	5
Capital Leases, Future Minimum Payments Due in Two Years	10
Capital Leases, Future Minimum Payments Due in Three Years	5
Capital Leases, Future Minimum Payments Due in Four Years	5
Capital Leases, Future Minimum Payments Due in Five Years	4
Capital Leases, Future Minimum Payments Due Thereafter	27
Capital Leases, Future Minimum Payments Due	56
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	0
Capital Leases, Future Minimum Payments, Interest Included in Payments	(24)
Capital Lease Obligations	$ 32