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Balance Sheet Components Schedule of Other Asssets and Other Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other current assets:    
Prepaid Expense, Current $ 50 $ 48
Margin Deposit Assets 11 8
Assets from price risk management activities 6 18
Other 6 3
Other Assets, Current 73 77
Accrued expenses and other current liabilities:    
Regulatory Liability, Current 31 51
Accrued employee compensation and benefits 60 52
Accrued interest payable 27 25
Dividends payable 31 30
Taxes Payable, Current 31 25
Other 61 71
Other Liabilities, Current $ 241 $ 254