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Fair Value Measurements - PacifiCorp (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset $ (35) $ (29)
Assets, fair value disclosure 3,715 3,945
Derivative liability, fair value, gross asset and right to reclaim cash, offset 110 105
Derivative Liability (80) (83)
Cash collateral, net receivable, offset against derivative positions 75 76
Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 3,011 3,296
Derivative Liability (1) (3)
Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 629 565
Derivative Liability (173) (175)
Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 110 113
Derivative Liability (16) (10)
Commodity derivative [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (35) (29)
Derivative assets 117 118
Derivative liability, fair value, gross asset and right to reclaim cash, offset 110 105
Derivative Liability (74) (75)
Commodity derivative [Member] | Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value, gross asset including not subject to master netting arrangement 0 1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (1) (3)
Commodity derivative [Member] | Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value, gross asset including not subject to master netting arrangement 53 42
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (168) (167)
Commodity derivative [Member] | Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value, gross asset including not subject to master netting arrangement 99 104
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (15) (10)
Money market mutual funds [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 716 685
Money market mutual funds [Member] | Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 716 685
Money market mutual funds [Member] | Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 0 0
Money market mutual funds [Member] | Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 0 0
Investment funds [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 187 178
Investment funds [Member] | Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 187 178
Investment funds [Member] | Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 0 0
Debt Securities, Trading, and Equity Securities, FV-NI   0
Investment funds [Member] | Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 0 0
Debt Securities, Trading, and Equity Securities, FV-NI   0
PacifiCorp [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 346 51
PacifiCorp [Member] | Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 336 42
PacifiCorp [Member] | Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 20 13
PacifiCorp [Member] | Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 0 0
PacifiCorp [Member] | Commodity derivative [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash collateral, net receivable, offset against derivative positions 70 74
PacifiCorp [Member] | Commodity derivative [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (10) (4)
Derivative assets 10 9
Derivative liability, fair value, gross asset and right to reclaim cash, offset 80 78
Derivative Liability (45) (39)
Cash collateral, net receivable, offset against derivative positions 70 74
PacifiCorp [Member] | Commodity derivative [Member] | Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value, gross asset including not subject to master netting arrangement 0 0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement 0 0
PacifiCorp [Member] | Commodity derivative [Member] | Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value, gross asset including not subject to master netting arrangement 20 13
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (125) (117)
PacifiCorp [Member] | Commodity derivative [Member] | Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value, gross asset including not subject to master netting arrangement 0 0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement 0 0
PacifiCorp [Member] | Money market mutual funds [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 310 21
PacifiCorp [Member] | Money market mutual funds [Member] | Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 310 21
PacifiCorp [Member] | Money market mutual funds [Member] | Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 0 0
PacifiCorp [Member] | Money market mutual funds [Member] | Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 0 0
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI 26 21
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI 26 21
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI 0 0
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI $ 0 $ 0