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Subsidiary Debt - Northern Powergrid (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Par value $ 39,634  
Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value 30,883  
Other long-term debt 30,672 $ 27,573
PacifiCorp [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value 7,705  
Other long-term debt $ 7,658 $ 7,015
PacifiCorp [Member] | Subsidiary Debt [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.60% 1.67%
PacifiCorp [Member] | Subsidiary Debt [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.80% 1.85%
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  
Northern Powergrid Holdings [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 3,234  
Other long-term debt 3,221 $ 2,626
Northern Powergrid Holdings [Member] | Bonds, 8.875%, due 2020 [Member]    
Debt Instrument [Line Items]    
Par value [1] 133  
Other long-term debt 135 133
Northern Powergrid Holdings [Member] | Bonds, 9.25%, due 2020 [Member]    
Debt Instrument [Line Items]    
Par value [1] 265  
Other long-term debt 265 260
Northern Powergrid Holdings [Member] | European Investment Bank loans, 4.133% to 4.586%, due 2019 to 2022 [Member]    
Debt Instrument [Line Items]    
Par value [1] 251  
Other long-term debt 252 293
Northern Powergrid Holdings [Member] | Bonds, 7.25%, due 2022 [Member]    
Debt Instrument [Line Items]    
Par value [1] 265  
Other long-term debt 270 262
Northern Powergrid Holdings [Member] | Bonds, 2.50%, due 2025 [Member]    
Debt Instrument [Line Items]    
Par value [1] 199  
Other long-term debt 197 189
Northern Powergrid Holdings [Member] | European Investment Bank loan, 2.073%, due 2025 [Member]    
Debt Instrument [Line Items]    
Par value [1] 66  
Other long-term debt 68 65
Northern Powergrid Holdings [Member] | European Investment Bank loans, 2.564%, due 2017 [Member]    
Debt Instrument [Line Items]    
Par value [1] 332  
Other long-term debt 330 318
Northern Powergrid Holdings [Member] | Bonds, 7.25%, due 2028 [Member]    
Debt Instrument [Line Items]    
Par value [1] 246  
Other long-term debt 250 241
Northern Powergrid Holdings [Member] | Bonds, 5.125%, due 2035 [Member]    
Debt Instrument [Line Items]    
Par value [1] 265  
Other long-term debt 262 252
Northern Powergrid Holdings [Member] | Bonds, 5.125%, due 2035 [Member]    
Debt Instrument [Line Items]    
Par value [1] 199  
Other long-term debt 197 189
Northern Powergrid Holdings [Member] | Bonds, 4.375%, due 2032 [Member]    
Debt Instrument [Line Items]    
Par value [1] 199  
Other long-term debt 196 188
Northern Powergrid Holdings [Member] | Variable-rate bond, due 2026 [Member]    
Debt Instrument [Line Items]    
Par value [1],[2] 217  
Other long-term debt [2] 214 236
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value 3,234  
Other long-term debt $ 3,221 $ 2,626
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, 4.133% to 4.586%, due 2019 to 2022 [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.133%  
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | European Investment Bank loans, 4.133% to 4.586%, due 2019 to 2022 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.586%  
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%
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%
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 2.54%  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.82%  
Northern Powergrid Holdings [Member] | Bonds, 2.25%, due 2059 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 398  
Other long-term debt $ 389  
Debt Instrument, Interest Rate, Stated Percentage 2.25%  
Northern Electric Plc [Member] | Guaranteed Bonds, 2.75%, due May 2049 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 199  
Other long-term debt $ 196  
Debt Instrument, Interest Rate, Stated Percentage 2.75%  
[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 86% of the outstanding debt. The variable interest rate as of December 31, 2019 was 2.54% while the fixed interest rate was 2.82%.