Subsidiary Debt Subsidiary Debt - PacifiCorp - Annual Payment on Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 3,431
Long-term Debt, Maturities, Repayments of Principal in Year Two	2,103
Long-term Debt, Maturities, Repayments of Principal in Year Three	1,674
Long-term Debt, Maturities, Repayments of Principal in Year Four	886
Long-term Debt, Maturities, Repayments of Principal in Year Five	1,838
Long-term Debt, Maturities, Repayments of Principal after Year Five	25,444
Par value	35,376
Long-term Debt	35,193	$ 36,116
PacifiCorp [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months	590
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	354
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	41
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	426
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	607
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	5,060
Total Long-term Debt Maturities and Capital Leases Future Minimum Payments	7,078
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	(36)
Long-term Debt	7,005	7,052
Total long-term debt and capital lease obligations	7,025	$ 7,079
PacifiCorp [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	586
Long-term Debt, Maturities, Repayments of Principal in Year Two	350
Long-term Debt, Maturities, Repayments of Principal in Year Three	38
Long-term Debt, Maturities, Repayments of Principal in Year Four	420
Long-term Debt, Maturities, Repayments of Principal in Year Five	605
Long-term Debt, Maturities, Repayments of Principal after Year Five	5,042
Par value	7,041
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	(36)
Long-term Debt	7,005
PacifiCorp [Member] | Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital Leases, Future Minimum Payments Due, Next Twelve Months	4
Capital Leases, Future Minimum Payments Due in Two Years	4
Capital Leases, Future Minimum Payments Due in Three Years	3
Capital Leases, Future Minimum Payments Due in Four Years	6
Capital Leases, Future Minimum Payments Due in Five Years	2
Capital Leases, Future Minimum Payments Due Thereafter	18
Capital Leases, Future Minimum Payments Due	37
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	0
Capital Lease Obligations	$ 20