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Contingencies (Loss Contingencies) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Litigation Contingencies |  |  |  |
Regulatory Liabilities |  | $ 1,751 | $ 2,114 | $ 269
Reversal Of Legal Contingency |  | 0 | 18 | $ 10
Environmental |  |  |  |
Environmental Contingencies |  |  |  |
Liability recorded for projected environmental remediation costs |  | 10 | 12 |
Loss Contingency, Range of Possible Loss, Maximum |  | 1 |  |
Litigation Contingencies |  |  |  |
Loss Contingency, Range of Possible Loss, Maximum |  | 1 |  |
Litigation |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Range of Possible Loss, Maximum |  | 1,400 |  |
Litigation Contingencies |  |  |  |
Aggregate reserves for claims deemed both probable and reasonably estimable |  | 189 | $ 199 |
Minimum potential loss |  | 1,100 |  |
Loss Contingency, Range of Possible Loss, Maximum |  | $ 1,400 |  |
Eletropaulo [Domain] |  |  |  |
Litigation Contingencies |  |  |  |
Reversal Of Legal Contingency | $ 161 |  |  |
Regulated Revenue [Member] | Eletropaulo [Domain] |  |  |  |
Litigation Contingencies |  |  |  |
Reversal Of Legal Contingency | 97 |  |  |
Interest Expense | Eletropaulo [Domain] |  |  |  |
Litigation Contingencies |  |  |  |
Reversal Of Legal Contingency | $ 64 |  |  |

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