Leases Leases - PacifiCorp - Lease Costs (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Variable Lease, Cost	$ 156	$ 453
Operating Lease, Cost	43	127
Finance Lease, Right-of-Use Asset, Amortization	4	12
Finance Lease, Interest Expense	10	31
Short-term Lease, Cost	2	6
Lease, Cost	$ 215	$ 629
Operating Lease, Weighted Average Remaining Lease Term	7 years 9 months 18 days	7 years 9 months 18 days
Finance Lease, Weighted Average Remaining Lease Term	29 years 3 months 18 days	29 years 3 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	5.20%	5.20%
Finance Lease, Weighted Average Discount Rate, Percent	8.60%	8.60%
PacifiCorp [Member]
Lessee, Lease, Description [Line Items]
Variable Lease, Cost	$ 10	$ 36
Operating Lease, Cost	1	2
Finance Lease, Right-of-Use Asset, Amortization	0	1
Finance Lease, Interest Expense	1	2
Short-term Lease, Cost	0	1
Lease, Cost	$ 12	$ 42
Operating Lease, Weighted Average Remaining Lease Term	13 years 7 months 9 days	13 years 7 months 9 days
Finance Lease, Weighted Average Remaining Lease Term	9 years 4 months 2 days	9 years 4 months 2 days
Operating Lease, Weighted Average Discount Rate, Percent	3.70%	3.70%
Finance Lease, Weighted Average Discount Rate, Percent	10.60%	10.60%