Employee Benefit Plans - PacifiCorp - Contributions and Benefit Payments (Details) $ in Millions	Dec. 31, 2019 USD ($)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 57
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	56
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	55
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	54
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	51
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	224
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	0
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	27
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	24
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	23
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	23
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	21
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	94
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	0
UNITED STATES | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	13
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	233
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	218
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	213
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	212
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	205
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	927
UNITED STATES | Pension Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	4
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	112
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	98
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	94
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	89
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	83
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 350