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Commitments and Contingencies - Legal Matters (Details) - USA Power [Member]
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
PacifiCorp [Member]  
Loss Contingencies [Line Items]  
Loss contingency, damages and attorney fees awarded, value $ 115
PacifiCorp [Member] | Damages from Breach of Contract, Awarded By Jury [Member]  
Loss Contingencies [Line Items]  
Loss contingency, damages awarded by jury, value 18
PacifiCorp [Member]  
Loss Contingencies [Line Items]  
Loss contingency, damages awarded, value 113
Loss contingency, damages and attorney fees awarded, value 115
Loss Contingency, Damages Paid, Value 123
PacifiCorp [Member] | Damages from Unjust Enrichment, Awarded By Jury [Member]  
Loss Contingencies [Line Items]  
Loss contingency, damages awarded by jury, value $ 113