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Contingencies and Commitments (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) agreement | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2013 USD ($)
Guarantees Letters Of Credit [Abstract] |  |  |  |  |
The range of expiration dates of guarantees made by the Parent Company |  | less than one year to more than 19 years |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 475 |  |  |
No. of Agreements | agreement |  | 26 |  |  |
Loss Contingency Accrual, Period Increase (Decrease) |  | $ (1) |  | $ 14 |
Guarantee Obligations [Member] |  |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 355 |  |  |
No. of Agreements | agreement |  | 13 |  |  |
Loss Contingency, Range of Possible Loss, Minimum |  | $ 1 |  |  |
Loss Contingency, Range of Possible Loss, Maximum |  | 53 |  |  |
Indemnification Agreement [Member] |  |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | [1] | $ 27 |  |  |
No. of Agreements | agreement | [1] | 1 |  |  |
Loss Contingency, Range of Possible Loss, Minimum | [1] | $ 27 |  |  |
Loss Contingency, Range of Possible Loss, Maximum | [1] | 27 |  |  |
Financial Standby Letter of Credit [Member] |  |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 62 |  |  |
No. of Agreements | agreement |  | 9 |  |  |
Loss Contingency, Range of Possible Loss, Minimum |  | $ 1 |  |  |
Loss Contingency, Range of Possible Loss, Maximum |  | 29 |  |  |
Standby Letters of Credit [Member] |  |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 31 |  |  |
No. of Agreements | agreement |  | 3 |  |  |
Loss Contingency, Range of Possible Loss, Minimum |  | $ 3 |  |  |
Loss Contingency, Range of Possible Loss, Maximum |  | $ 15 |  |  |
Minimum [Member] | Standby Letters of Credit [Member] |  |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |  |
Letter of credit fee percentage paid |  | 0.20% |  |  |
Maximum [Member] | Standby Letters of Credit [Member] |  |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |  |
Letter of credit fee percentage paid |  | 2.50% |  |  |
Eletropaulo [Domain] | Regulatory Liability [Domain] |  |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) |  |  | $ 161 |  | $ (269)
[1] | (1) Excludes normal and customary representations and warranties in agreements for the sale of assets (including ownership in associated legal entities) where the associated risk is considered to be nominal.

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