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Subsidiary Debt Subsidiary Debt - Pacificorp (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]          
Current portion of long-term debt $ 2,539 $ 2,081      
Par value 39,634        
Long-term Debt 39,353 36,774      
PacifiCorp [Member]          
Debt Instrument [Line Items]          
Current portion of long-term debt 38 350 $ 586 $ 52 $ 66
Long-term Debt, Excluding Current Maturities 7,620 6,665 $ 6,419 $ 7,000 $ 7,048
Long-term Debt 7,658 7,015      
Maximum amount of additional long-term debt approved by regulators 1,000        
Eligible Property Subject To Lien Of Mortgages 29,000        
PacifiCorp [Member] | Letters of credit supporting tax-exempt bond obligations [Member]          
Debt Instrument [Line Items]          
Letters of Credit Outstanding, Amount   $ 170      
PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due Through 2024 [Member]          
Debt Instrument [Line Items]          
Par value $ 1,899        
Long-term Debt, Weighted Average Interest Rate, at Point in Time 4.09% 4.31%      
PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due Through 2024 [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 Through 2024 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 8.53% 8.53%      
PacifiCorp [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2025 to 2026 [Member]          
Debt Instrument [Line Items]          
Par value $ 350        
Long-term Debt, Weighted Average Interest Rate, at Point in Time 4.31% 4.31%      
PacifiCorp [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2025 to 2026 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.35% 3.35%      
PacifiCorp [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2025 to 2026 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 6.71% 6.71%      
PacifiCorp [Member] | First Mortgage Bonds, 3.50% to 7.70%, Due 2029 to 2031 [Member]          
Debt Instrument [Line Items]          
Par value $ 700        
Long-term Debt, Weighted Average Interest Rate, at Point in Time 5.30% 7.70%      
Debt Instrument, Interest Rate, Stated Percentage   7.70%      
PacifiCorp [Member] | First Mortgage Bonds, 3.50% to 7.70%, Due 2029 to 2031 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.50%        
PacifiCorp [Member] | First Mortgage Bonds, 3.50% to 7.70%, Due 2029 to 2031 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 7.70% 7.70%      
PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 6.35%, Due 2034 to 2038 [Member]          
Debt Instrument [Line Items]          
Par value $ 2,350        
Long-term Debt, Weighted Average Interest Rate, at Point in Time 5.96% 5.96%      
PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 6.35%, Due 2034 to 2038 [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 6.35%, Due 2034 to 2038 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 6.35% 6.35%      
PacifiCorp [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member]          
Debt Instrument [Line Items]          
Par value $ 950        
Long-term Debt, Weighted Average Interest Rate, at Point in Time 5.40% 5.40%      
PacifiCorp [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.10% 4.10%      
PacifiCorp [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 6.00% 6.00%      
PacifiCorp [Member] | First Mortgage Bonds, 4.13% to 4.15%, Due 2049 to 2050 [Member]          
Debt Instrument [Line Items]          
Par value $ 1,200        
Long-term Debt, Weighted Average Interest Rate, at Point in Time 4.14% 4.13%      
Debt Instrument, Interest Rate, Stated Percentage   4.13%      
PacifiCorp [Member] | First Mortgage Bonds, 4.13% to 4.15%, Due 2049 to 2050 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.13%        
PacifiCorp [Member] | First Mortgage Bonds, 4.13% to 4.15%, Due 2049 to 2050 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.15%        
PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2020 [Member]          
Debt Instrument [Line Items]          
Par value $ 38        
Long-term Debt, Weighted Average Interest Rate, at Point in Time 1.78% 1.85%      
PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2025 [Member]          
Debt Instrument [Line Items]          
Par value [1] $ 25        
Long-term Debt, Weighted Average Interest Rate, at Point in Time [1] 1.75% 1.75%      
PacifiCorp [Member] | Variable-rate tax-exempt obligation series due 2024 [Member]          
Debt Instrument [Line Items]          
Par value [1],[2] $ 143        
Long-term Debt, Weighted Average Interest Rate, at Point in Time [1],[2] 1.73% 1.68%      
PacifiCorp [Member] | Variable-rate tax-exempt obligation series due 2024 to 2025 [Member]          
Debt Instrument [Line Items]          
Par value [2] $ 50        
Long-term Debt, Weighted Average Interest Rate, at Point in Time [2] 1.63% 1.75%      
PacifiCorp [Member] | Long-term Debt [Member]          
Debt Instrument [Line Items]          
Par value $ 7,705        
Long-term Debt 7,658 $ 7,015      
PacifiCorp [Member] | PacifiCorp [Member]          
Debt Instrument [Line Items]          
Par value 7,705        
Other long-term debt 7,658 7,015      
PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due Through 2024 [Member]          
Debt Instrument [Line Items]          
Long-term Debt 1,895 2,244      
PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2025 to 2026 [Member]          
Debt Instrument [Line Items]          
Long-term Debt 349 348      
PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 3.50% to 7.70%, Due 2029 to 2031 [Member]          
Debt Instrument [Line Items]          
Long-term Debt 696 298      
PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 6.35%, Due 2034 to 2038 [Member]          
Debt Instrument [Line Items]          
Long-term Debt 2,338 2,338      
PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member]          
Debt Instrument [Line Items]          
Long-term Debt 939 939      
PacifiCorp [Member] | PacifiCorp [Member] | First Mortgage Bonds, 4.13% to 4.15%, Due 2049 to 2050 [Member]          
Debt Instrument [Line Items]          
Long-term Debt 1,186 593      
PacifiCorp [Member] | PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2020 [Member]          
Debt Instrument [Line Items]          
Long-term Debt 38 38      
PacifiCorp [Member] | PacifiCorp [Member] | Tax-exempt bond obligations, variable rate series, due 2025 [Member]          
Debt Instrument [Line Items]          
Long-term Debt [1] 24 25      
PacifiCorp [Member] | PacifiCorp [Member] | Variable-rate tax-exempt obligation series due 2024 [Member]          
Debt Instrument [Line Items]          
Long-term Debt [1],[2] 143 142      
PacifiCorp [Member] | PacifiCorp [Member] | Variable-rate tax-exempt obligation series due 2024 to 2025 [Member]          
Debt Instrument [Line Items]          
Long-term Debt [2] 50 50      
Subsidiary Debt [Member]          
Debt Instrument [Line Items]          
Par value 30,883        
Other long-term debt 30,672 27,573      
Subsidiary Debt [Member] | PacifiCorp [Member]          
Debt Instrument [Line Items]          
Par value 7,705        
Other long-term debt $ 7,658 $ 7,015      
Subsidiary Debt [Member] | PacifiCorp [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.60% 1.67%      
Subsidiary Debt [Member] | PacifiCorp [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.80% 1.85%      
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due Through 2024 [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 Through 2024 [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, 3.35% To 6.71%, Due 2025 to 2026 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.35% 3.35%      
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2025 to 2026 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 6.71% 6.71%      
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 5.25% To 6.35%, Due 2034 to 2038 [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 6.35%, Due 2034 to 2038 [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% To 6.00%, Due 2039 To 2042 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.10% 4.10%      
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 6.00% 6.00%      
Subsidiary Debt [Member] | PacifiCorp [Member] | First Mortgage Bonds, 4.13% to 4.15%, Due 2049 to 2050 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage        
[1] Supported by $170 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2018. These arrangements were canceled in 2019.
[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.