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Fair Value Measurements - PacifiCorp (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
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 $ (25) $ (52)
Assets, fair value disclosure 4,266 3,114
Derivative liability, fair value, gross asset and right to reclaim cash, offset 117 111
Derivative Liability (120) (111)
Cash collateral, net receivable, offset against derivative positions 92 59
Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 2,995 2,423
Derivative Liability (4) (1)
Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 1,165 625
Derivative Liability (211) (212)
Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 131 118
Derivative Liability (22) (9)
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 (25) (52)
Derivative assets 119 148
Derivative liability, fair value, gross asset and right to reclaim cash, offset 117 111
Derivative Liability (92) (79)
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 (2) (1)
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 38 91
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (187) (180)
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 106 108
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (20) (9)
Money market mutual funds [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, FV-NI 951 409
Money market mutual funds [Member] | Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, FV-NI 951 409
Money market mutual funds [Member] | Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, FV-NI 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]    
Equity Securities, FV-NI 0 0
Investment funds [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, FV-NI 182 128
Investment funds [Member] | Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, FV-NI 182 128
Investment funds [Member] | Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, FV-NI 0 0
Investment funds [Member] | Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, FV-NI 0 0
PacifiCorp [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 477 121
PacifiCorp [Member] | Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 467 93
PacifiCorp [Member] | Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 27 51
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 55 59
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 (17) (23)
Derivative assets 10 28
Derivative liability, fair value, gross asset and right to reclaim cash, offset 72 82
Derivative Liability (57) (66)
Cash collateral, net receivable, offset against derivative positions 55 59
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 27 51
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (129) (148)
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]    
Equity Securities, FV-NI 442 69
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]    
Equity Securities, FV-NI 442 69
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]    
Equity Securities, FV-NI 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]    
Equity Securities, FV-NI 0 0
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, FV-NI 25 24
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, FV-NI 25 24
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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]    
Equity Securities, FV-NI $ 0 $ 0