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Subsidiary Debt - Northern Powergrid (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Par value $ 37,014  
Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value 28,263  
Other long-term debt 28,097 $ 28,641
PacifiCorp [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value 7,076  
Other long-term debt $ 7,036 $ 7,025
PacifiCorp [Member] | Subsidiary Debt [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.67% 1.60%
PacifiCorp [Member] | Subsidiary Debt [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.85% 1.87%
PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 4.125%, Due 2049 [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.125%  
Northern Powergrid Holdings [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 2,621  
Other long-term debt 2,626 $ 2,805
Northern Powergrid Holdings [Member] | Bonds, 8.875%, due 2020 [Member]    
Debt Instrument [Line Items]    
Par value [1] 128  
Other long-term debt 133 144
Northern Powergrid Holdings [Member] | Bonds, 9.25%, due 2020 [Member]    
Debt Instrument [Line Items]    
Par value [1] 255  
Other long-term debt 260 279
Northern Powergrid Holdings [Member] | European Investment Bank loans, 3.901% to 4.586%, due 2018 to 2022 [Member]    
Debt Instrument [Line Items]    
Par value [1] 294  
Other long-term debt 293 366
Northern Powergrid Holdings [Member] | Bonds, 7.25%, due 2022 [Member]    
Debt Instrument [Line Items]    
Par value [1] 255  
Other long-term debt 262 279
Northern Powergrid Holdings [Member] | Bonds, 2.50%, due 2025 [Member]    
Debt Instrument [Line Items]    
Par value [1] 191  
Other long-term debt 189 200
Northern Powergrid Holdings [Member] | European Investment Bank loan, 2.073%, due 2025 [Member]    
Debt Instrument [Line Items]    
Par value [1] 64  
Other long-term debt 65 69
Northern Powergrid Holdings [Member] | European Investment Bank loans, 2.564%, due 2017 [Member]    
Debt Instrument [Line Items]    
Par value [1] 319  
Other long-term debt 318 336
Northern Powergrid Holdings [Member] | Bonds, 7.25%, due 2028 [Member]    
Debt Instrument [Line Items]    
Par value [1] 237  
Other long-term debt 241 256
Northern Powergrid Holdings [Member] | Bonds, 5.125%, due 2035 [Member]    
Debt Instrument [Line Items]    
Par value [1] 255  
Other long-term debt 252 267
Northern Powergrid Holdings [Member] | Bonds, 5.125%, due 2035 [Member]    
Debt Instrument [Line Items]    
Par value [1] 191  
Other long-term debt 189 200
Northern Powergrid Holdings [Member] | Bonds, 4.375%, due 2032 [Member]    
Debt Instrument [Line Items]    
Par value [1] 191  
Other long-term debt 188 199
Northern Powergrid Holdings [Member] | Variable-rate bond, due 2026 [Member]    
Debt Instrument [Line Items]    
Par value [1],[2] 241  
Other long-term debt [2] 236 210
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value 2,621  
Other long-term debt $ 2,626 $ 2,805
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 8.875%, due 2020 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 8.875% 8.875%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 9.25%, due 2020 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 9.25% 9.25%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | European Investment Bank loans, 3.901% to 4.586%, due 2018 to 2022 [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.901% 3.901%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | European Investment Bank loans, 3.901% to 4.586%, due 2018 to 2022 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.586% 4.586%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 7.25%, due 2022 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 7.25% 7.25%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 2.50%, due 2025 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 2.50% 2.50%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | European Investment Bank loan, 2.073%, due 2025 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 2.073% 2.073%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | European Investment Bank loans, 2.564%, due 2017 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 2.564% 2.564%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 7.25%, due 2028 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 7.25% 7.25%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 5.125%, due 2035 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.125% 5.125%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 5.125%, due 2035 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.125% 5.125%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Bonds, 4.375%, due 2032 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.375% 4.375%
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | Variable-rate bond, due 2026 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.66%  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.82%  
[1] (1)The par values for these debt instruments are denominated in sterling.
[2] (2)Amortizes semiannually and the Company has entered into an interest rate swap that fixes the interest rate on 85% of the outstanding debt. The variable interest rate as of December 31, 2018 was 2.66% while the fixed interest rate was 2.82%.