Employee Benefit Plans - PacifiCorp - Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	$ 736	$ 666
Defined Benefit Plan, Plan Assets, Contributions by Employer	8	5
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	8	10
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(38)	106
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(50)	(51)
Ending balance	664	736	$ 666
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	721	734
Defined Benefit Plan, Service Cost	9	9	9
Defined Benefit Plan, Interest Cost	24	29	31
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	8	10
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(40)	(10)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(50)	(51)
Defined Benefit Plan, Benefit Obligation	721	734	734	$ 672	$ 721
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan				(8)	15
Assets for Plan Benefits, Defined Benefit Plan				5	32
Other current liabilities				0	0
Liability, Defined Benefit Plan, Noncurrent				(13)	(17)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position				(8)	15
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount				256	272
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	332	302
Defined Benefit Plan, Plan Assets, Contributions by Employer	1	1
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	5	7
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(16)	49
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(25)	(27)
Ending balance	297	332	302
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	331	358
Defined Benefit Plan, Service Cost	2	2	2
Defined Benefit Plan, Interest Cost	11	14	15
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	5	7
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(26)	(23)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(25)	(27)
Defined Benefit Plan, Benefit Obligation	331	358	358	298	331
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan				(1)	1
Assets for Plan Benefits, Defined Benefit Plan				0	1
Other current liabilities				0	0
Liability, Defined Benefit Plan, Noncurrent				(1)	0
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position				(1)	1
PacifiCorp [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount				52	60
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,761	2,525
Defined Benefit Plan, Plan Assets, Contributions by Employer	38	64
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(147)	390
Defined Benefit Plan, Plan Assets, Payment for Settlement	(119)	(15)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(137)	(203)
Ending balance	2,396	2,761	2,525
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	3,006	2,952
Defined Benefit Plan, Service Cost	21	24	29
Defined Benefit Plan, Interest Cost	105	116	126
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(160)	132
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(137)	(203)
Defined Benefit Plan, Benefit Obligation	3,006	2,952	2,952	2,718	3,006
Defined Benefit Plan, Accumulated Benefit Obligation				2,709	2,988
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan				(322)	(245)
Assets for Plan Benefits, Defined Benefit Plan				20	66
Other current liabilities				(13)	(14)
Liability, Defined Benefit Plan, Noncurrent				(329)	(297)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position				(322)	(245)
Domestic Plan [Member] | PacifiCorp [Member] | Pension Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,111	999
Defined Benefit Plan, Plan Assets, Contributions by Employer	4	54
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(52)	166
Defined Benefit Plan, Plan Assets, Payment for Settlement	(52)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(69)	(108)
Ending balance	942	1,111	999
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	1,251	1,276
Defined Benefit Plan, Service Cost	0	0	4
Defined Benefit Plan, Interest Cost	43	49	54
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(68)	34
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(69)	(108)
Defined Benefit Plan, Benefit Obligation	$ 1,251	$ 1,276	$ 1,276	1,105	1,251
Defined Benefit Plan, Accumulated Benefit Obligation				1,105	1,251
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan				(163)	(140)
Assets for Plan Benefits, Defined Benefit Plan				3	5
Other current liabilities				(4)	(4)
Liability, Defined Benefit Plan, Noncurrent				(162)	(141)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position				(163)	(140)
Cash and Cash Equivalents [Member] | PacifiCorp [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount				1	9
Other Noncurrent Assets [Member] | PacifiCorp [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount				$ 51	$ 51