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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

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