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Employee Benefit Plans - PacifiCorp - Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Beginning balance $ 742 $ 664      
Defined Benefit Plan, Plan Assets, Contributions by Employer 3 2      
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31) 8 9      
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 40 122      
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0      
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) (49) (55)      
Ending balance 744 742 $ 664    
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Beginning balance 673 672      
Defined Benefit Plan, Service Cost 7 8 9    
Defined Benefit Plan, Interest Cost 21 27 24    
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31) 8 9      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 61 12      
Benefits Paid (49) (55)      
Defined Benefit Plan, Benefit Obligation 673 672 672 $ 758 $ 673
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]          
Defined Benefit Plan, Funded (Unfunded) Status of Plan       (14) 69
Assets for Plan Benefits, Defined Benefit Plan       20 76
Other current liabilities       0 0
Liability, Defined Benefit Plan, Noncurrent       (34) (7)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position       (14) 69
Supplemental Employee Retirement Plan [Member]          
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]          
Life Insurance, Corporate or Bank Owned, Amount       303 252
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Beginning balance 334 297      
Defined Benefit Plan, Plan Assets, Contributions by Employer [1] 0 1      
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31) 4 5      
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 15 55      
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) (26) (24)      
Ending balance 327 334 297    
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Beginning balance 304 298      
Defined Benefit Plan, Service Cost 2 2 2    
Defined Benefit Plan, Interest Cost 9 12 11    
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31) 4 5      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 14 11      
Benefits Paid (26) (24)      
Defined Benefit Plan, Benefit Obligation 304 298 298 307 304
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]          
Defined Benefit Plan, Funded (Unfunded) Status of Plan       20 30
Assets for Plan Benefits, Defined Benefit Plan       20 30
Other current liabilities       0 0
Liability, Defined Benefit Plan, Noncurrent       0 0
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position       20 30
PacifiCorp [Member] | Supplemental Employee Retirement Plan [Member]          
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]          
Life Insurance, Corporate or Bank Owned, Amount       61 57
UNITED STATES | Pension Plan [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Beginning balance 2,656 2,396      
Defined Benefit Plan, Plan Assets, Contributions by Employer 13 12      
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31) 0 0      
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 373 456      
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 (22)      
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) (218) (186)      
Ending balance 2,824 2,656 2,396    
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Beginning balance 2,878 2,718      
Defined Benefit Plan, Service Cost 17 16 21    
Defined Benefit Plan, Interest Cost 93 111 105    
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31) 0 0      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 226 242      
Benefits Paid (218) (186)      
Defined Benefit Plan, Benefit Obligation 2,878 2,718 2,718 3,077 2,878
Defined Benefit Plan, Accumulated Benefit Obligation       2,999 2,867
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]          
Defined Benefit Plan, Funded (Unfunded) Status of Plan       (253) (222)
Assets for Plan Benefits, Defined Benefit Plan       43 73
Other current liabilities       (13) (13)
Liability, Defined Benefit Plan, Noncurrent       (283) (282)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position       (253) (222)
UNITED STATES | PacifiCorp [Member] | Pension Plan [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Beginning balance 1,036 942      
Defined Benefit Plan, Plan Assets, Contributions by Employer [1] 5 4      
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31) 0 0      
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 124 181      
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) (101) (91)      
Ending balance 1,064 1,036 942    
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Beginning balance 1,167 1,105      
Defined Benefit Plan, Service Cost 0 0 0    
Defined Benefit Plan, Interest Cost 36 44 43    
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31) 0 0      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 100 109      
Benefits Paid (101) (91)      
Defined Benefit Plan, Benefit Obligation $ 1,167 $ 1,105 $ 1,105 1,202 1,167
Defined Benefit Plan, Accumulated Benefit Obligation       1,202 1,167
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]          
Defined Benefit Plan, Funded (Unfunded) Status of Plan       (138) (131)
Assets for Plan Benefits, Defined Benefit Plan       8 7
Other current liabilities       (4) (4)
Liability, Defined Benefit Plan, Noncurrent       (142) (134)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position       $ (138) $ (131)
[1] Amounts represent employer contributions to the SERP