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Subsidiary Debt Subsidiary Debt - Pacificorp (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Par value $ 38,133    
Long-term Debt 37,972   $ 38,649
PacifiCorp [Member]      
Debt Instrument [Line Items]      
Long-term Debt 7,114   6,985
Long-term Debt and Capital Lease Obligations, Principal Amount 7,191    
Current portion of long-term debt and capital lease obligations 68   134
Long-term debt and capital lease obligations 7,078   6,885
Total long-term debt and capital lease obligations 7,146   7,019
Letters of Credit Outstanding, Amount 310   451
Maximum amount of additional long-term debt approved by regulators 1,325    
Eligible Property Subject To Lien Of Mortgages 25,000    
Capital Leases, Balance Sheet, Assets by Major Class, Net 32   34
PacifiCorp [Member] | Letters of credit supporting tax-exempt bond obligations [Member]      
Debt Instrument [Line Items]      
Letters of Credit Outstanding, Amount 310   451
PacifiCorp [Member] | First Mortgage Bonds, 5.50% To 8.635%, Due Through 2019 [Member]      
Debt Instrument [Line Items]      
Par value 855    
Long-term Debt $ 853   $ 859
Long-term Debt, Weighted Average Interest Rate 5.61%   5.63%
PacifiCorp [Member] | First Mortgage Bonds, 5.50% To 8.635%, Due Through 2019 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.50%   5.50%
PacifiCorp [Member] | First Mortgage Bonds, 5.50% To 8.635%, Due Through 2019 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 8.635%   8.635%
PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2021 To 2025 [Member]      
Debt Instrument [Line Items]      
Par value $ 2,149    
Long-term Debt $ 2,137   $ 1,888
Long-term Debt, Weighted Average Interest Rate 4.01%   4.09%
PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2021 To 2025 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 2.95%   2.95%
PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2021 To 2025 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 8.53%   8.53%
PacifiCorp [Member] | First Mortgage Bonds, 6.71%, Due 2026 [Member]      
Debt Instrument [Line Items]      
Par value $ 100    
Long-term Debt $ 100   $ 100
Long-term Debt, Weighted Average Interest Rate 6.71%   6.71%
Debt Instrument, Interest Rate, Stated Percentage 6.71%   6.71%
PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 7.70%, Due 2031 To 2035 [Member]      
Debt Instrument [Line Items]      
Par value $ 800    
Long-term Debt $ 794   $ 793
Long-term Debt, Weighted Average Interest Rate 6.33%   6.33%
PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 7.70%, Due 2031 To 2035 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.25%   5.25%
PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 7.70%, Due 2031 To 2035 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 7.70%   7.70%
PacifiCorp [Member] | First Mortgage Bonds, 5.75% To 6.35%, Due 2036 To 2039 [Member]      
Debt Instrument [Line Items]      
Par value $ 2,500    
Long-term Debt $ 2,480   $ 2,479
Long-term Debt, Weighted Average Interest Rate 6.06%   6.06%
PacifiCorp [Member] | First Mortgage Bonds, 5.75% To 6.35%, Due 2036 To 2039 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.75%   5.75%
PacifiCorp [Member] | First Mortgage Bonds, 5.75% To 6.35%, Due 2036 To 2039 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 6.35%   6.35%
PacifiCorp [Member] | First Mortgage Bonds, 4.10%, Due 2042 [Member]      
Debt Instrument [Line Items]      
Par value $ 300    
Long-term Debt $ 297   $ 297
Long-term Debt, Weighted Average Interest Rate 4.10%   4.10%
Debt Instrument, Interest Rate, Stated Percentage 4.10%   4.10%
PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2018 to 2025 [Member]      
Debt Instrument [Line Items]      
Par value [1] $ 107    
Long-term Debt [1] $ 107   $ 223
Long-term Debt, Weighted Average Interest Rate [1] 0.01%   0.03%
PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2016 to 2024 [Member]      
Debt Instrument [Line Items]      
Par value [1],[2] $ 198    
Long-term Debt [1],[2] $ 196   $ 219
Long-term Debt, Weighted Average Interest Rate [1],[2] 0.02%   0.02%
PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2016 to 2025 [Member]      
Debt Instrument [Line Items]      
Par value [2] $ 59    
Long-term Debt [2] $ 59   $ 36
Long-term Debt, Weighted Average Interest Rate [2] 0.21%   0.22%
PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2017 to 2018 [Member]      
Debt Instrument [Line Items]      
Par value $ 91    
Long-term Debt $ 91   $ 91
Long-term Debt, Weighted Average Interest Rate 0.22%   0.22%
PacifiCorp [Member] | Long-term Debt [Member]      
Debt Instrument [Line Items]      
Par value $ 7,159    
Long-term Debt $ 7,114   $ 6,985
PacifiCorp [Member] | Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Weighted Average Interest Rate 11.25%   11.33%
Capital Lease Obligations $ 32   $ 34
PacifiCorp [Member] | Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 8.75%   8.75%
PacifiCorp [Member] | Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 14.61%   14.61%
PacifiCorp [Member] | First Mortgage Bonds, 3.35%, Due July 2025 [Member]      
Debt Instrument [Line Items]      
Par value   $ 250  
Debt Instrument, Interest Rate, Stated Percentage   3.35%  
Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value $ 27,314    
Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value 7,204    
Eligible Property Subject To Lien Of Mortgages 25,000    
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.50% To 8.635%, Due Through 2019 [Member]      
Debt Instrument [Line Items]      
Par value $ 855    
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.50% To 8.635%, Due Through 2019 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.50%   5.50%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.50% To 8.635%, Due Through 2019 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 8.635%   8.635%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2021 To 2025 [Member]      
Debt Instrument [Line Items]      
Par value $ 2,149    
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2021 To 2025 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 2.95%   2.95%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2021 To 2025 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 8.53%   8.53%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 6.71%, Due 2026 [Member]      
Debt Instrument [Line Items]      
Par value $ 100    
Debt Instrument, Interest Rate, Stated Percentage 6.71%   6.71%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 7.70%, Due 2031 To 2035 [Member]      
Debt Instrument [Line Items]      
Par value $ 800    
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 7.70%, Due 2031 To 2035 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.25%   5.25%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 7.70%, Due 2031 To 2035 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 7.70%   7.70%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.75% To 6.35%, Due 2036 To 2039 [Member]      
Debt Instrument [Line Items]      
Par value $ 2,500    
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.75% To 6.35%, Due 2036 To 2039 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.75%   5.75%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.75% To 6.35%, Due 2036 To 2039 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 6.35%   6.35%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 4.10%, Due 2042 [Member]      
Debt Instrument [Line Items]      
Par value $ 300    
Debt Instrument, Interest Rate, Stated Percentage 4.10%   4.10%
Subsidiary Debt [Member] | PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2018 to 2025 [Member]      
Debt Instrument [Line Items]      
Par value [3] $ 107    
Subsidiary Debt [Member] | PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2016 to 2024 [Member]      
Debt Instrument [Line Items]      
Par value [3],[4] 198    
Subsidiary Debt [Member] | PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2016 to 2025 [Member]      
Debt Instrument [Line Items]      
Par value [4] 59    
Subsidiary Debt [Member] | PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2017 to 2018 [Member]      
Debt Instrument [Line Items]      
Par value $ 91    
[1] 1)Supported by $310 million and $451 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2015 and 2014, respectively.
[2] 2)Secured by pledged first mortgage bonds registered to and held by the tax-exempt bond trustee generally with the same interest rates, maturity dates and redemption provisions as the tax-exempt bond obligations.
[3] Supported by $310 million and $451 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2015 and 2014, respectively.
[4] Secured by pledged first mortgage bonds registered to and held by the tax-exempt bond trustee generally with the same interest rates, maturity dates and redemption provisions as the tax-exempt bond obligations.