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Balance Sheet Components (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for Doubtful Accounts Receivable, Current |  | $ 6 | $ 6 | $ 6 | $ 6
Loss Contingency, Damages Awarded, Value | $ 81 |  |  |  |
Jointly Owned Electricity Generation Plant [Member] |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  | $ 6 | $ 44 |  |

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