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Subsidiary Debt Subsidiary Debt - Pacificorp (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Par value $ 36,295  
Long-term Debt 36,116 $ 37,972
PacifiCorp [Member]    
Debt Instrument [Line Items]    
Long-term Debt 7,052 7,114
Long-term Debt and Capital Lease Obligations, Principal Amount 7,120  
Current portion of long-term debt and capital lease obligations 58 68
Long-term debt and capital lease obligations 7,021 7,078
Total long-term debt and capital lease obligations 7,079 7,146
Letters of Credit Outstanding, Amount 255 310
Maximum amount of additional long-term debt approved by regulators 1,325  
Eligible Property Subject To Lien Of Mortgages 26,000  
Capital Leases, Balance Sheet, Assets by Major Class, Net 27 32
PacifiCorp [Member] | Letters of credit supporting tax-exempt bond obligations [Member]    
Debt Instrument [Line Items]    
Letters of Credit Outstanding, Amount $ 255 $ 310
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 3.85% 3.85%
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 8.53% 8.53%
PacifiCorp [Member] | First Mortgage Bonds, 3.85% To 8.53%, Due Through 2021 [Member]    
Debt Instrument [Line Items]    
Par value $ 1,272  
Long-term Debt $ 1,269 $ 1,271
Long-term Debt, Weighted Average Interest Rate 5.10% 5.10%
PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.27%, Due 2022 To 2026 [Member]    
Debt Instrument [Line Items]    
Par value $ 1,829  
Long-term Debt $ 1,820 $ 1,819
Long-term Debt, Weighted Average Interest Rate 4.10% 4.10%
PacifiCorp [Member] | First Mortgage Bonds, 7.70%, Due 2031 [Member]    
Debt Instrument [Line Items]    
Par value $ 300  
Long-term Debt $ 298 $ 298
Long-term Debt, Weighted Average Interest Rate 7.70% 7.70%
PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 6.10%, Due 2034 to 2036 [Member]    
Debt Instrument [Line Items]    
Par value $ 850  
Long-term Debt $ 843 $ 843
Long-term Debt, Weighted Average Interest Rate 5.80% 5.80%
PacifiCorp [Member] | First Mortgage Bonds, 5.75% To 6.35%, Due 2037 To 2039 [Member]    
Debt Instrument [Line Items]    
Par value $ 2,150  
Long-term Debt $ 2,134 $ 2,133
Long-term Debt, Weighted Average Interest Rate 6.00% 6.00%
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] $ 108  
Long-term Debt [1] $ 108 $ 107
Long-term Debt, Weighted Average Interest Rate [1] 0.74% 0.01%
PacifiCorp [Member] | Variable-rate tax-exempt obligation series due 2024 [Member]    
Debt Instrument [Line Items]    
Par value [1],[2] $ 143  
Long-term Debt [1],[2] $ 142 $ 196
Long-term Debt, Weighted Average Interest Rate [1],[2] 0.70% 0.02%
PacifiCorp [Member] | Variable-rate tax-exempt obligation series due 2024 to 2025 [Member]    
Debt Instrument [Line Items]    
Par value [2] $ 50  
Long-term Debt [2] $ 50 $ 59
Long-term Debt, Weighted Average Interest Rate [2] 0.80% 0.21%
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 0.85% 0.22%
PacifiCorp [Member] | Long-term Debt [Member]    
Debt Instrument [Line Items]    
Par value $ 7,093  
Long-term Debt $ 7,052 $ 7,114
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 11.09% 11.25%
Capital Lease Obligations $ 27 $ 32
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, 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 8.27% 8.27%
PacifiCorp [Member] | First Mortgage Bonds, 6.71%, Due 2026 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 7.70% 7.70%
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 6.10% 6.10%
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%
Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value $ 27,476  
Subsidiary Debt [Member] | PacifiCorp [Member]    
Debt Instrument [Line Items]    
Par value 7,120  
Eligible Property Subject To Lien Of Mortgages $ 26,000  
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 3.85% To 8.53%, Due Through 2021 [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.85% 3.85%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 3.85% To 8.53%, Due Through 2021 [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, 2.95% To 8.27%, Due 2022 To 2026 [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 8.27%, Due 2022 To 2026 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 8.27% 8.27%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 7.70%, Due 2031 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 7.70% 7.70%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 6.10%, Due 2034 to 2036 [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 6.10%, Due 2034 to 2036 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.10% 6.10%
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.75% To 6.35%, Due 2037 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 2037 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]    
Debt Instrument, Interest Rate, Stated Percentage 4.10% 4.10%
Subsidiary Debt [Member] | 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%  
Subsidiary Debt [Member] | 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%  
Subsidiary Debt [Member] | PacifiCorp [Member] | PacifiCorp [Member]    
Debt Instrument [Line Items]    
Par value $ 7,120  
Subsidiary Debt [Member] | PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 3.85% To 8.53%, Due Through 2021 [Member]    
Debt Instrument [Line Items]    
Par value 1,272  
Subsidiary Debt [Member] | PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.27%, Due 2022 To 2026 [Member]    
Debt Instrument [Line Items]    
Par value 1,829  
Subsidiary Debt [Member] | PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 7.70%, Due 2031 [Member]    
Debt Instrument [Line Items]    
Par value 300  
Subsidiary Debt [Member] | PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 6.10%, Due 2034 to 2036 [Member]    
Debt Instrument [Line Items]    
Par value 850  
Subsidiary Debt [Member] | PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.75% To 6.35%, Due 2037 To 2039 [Member]    
Debt Instrument [Line Items]    
Par value 2,150  
Subsidiary Debt [Member] | PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 4.10%, Due 2042 [Member]    
Debt Instrument [Line Items]    
Par value 300  
Subsidiary Debt [Member] | PacifiCorp [Member] | PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2018 to 2025 [Member]    
Debt Instrument [Line Items]    
Par value [3] 108  
Subsidiary Debt [Member] | PacifiCorp [Member] | PacifiCorp [Member] | Variable-rate tax-exempt obligation series due 2024 [Member]    
Debt Instrument [Line Items]    
Par value [3],[4] 143  
Subsidiary Debt [Member] | PacifiCorp [Member] | PacifiCorp [Member] | Variable-rate tax-exempt obligation series due 2024 to 2025 [Member]    
Debt Instrument [Line Items]    
Par value [4] 50  
Subsidiary Debt [Member] | PacifiCorp [Member] | PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2017 to 2018 [Member]    
Debt Instrument [Line Items]    
Par value [3] 91  
Subsidiary Debt [Member] | PacifiCorp [Member] | PacifiCorp [Member] | Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member]    
Debt Instrument [Line Items]    
Par value $ 27  
[1] 1)Supported by $255 million and $310 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2016 and 2015, 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 $255 million and $310 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2016 and 2015, 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.