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Contingencies and Commitments (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) agreement | Sep. 30, 2015 USD ($) agreement | Dec. 31, 2013 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Regulatory Liabilities |  |  |  | $ 269
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 |
Obligations made by the Parent Company associated with non-recourse debt |  | $ 14 | $ 14 |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 482 | $ 482 |
Number of Agreements | agreement |  | 29 | 29 |
Guarantee Obligations [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 341 | $ 341 |
Number of Agreements | agreement |  | 13 | 13 |
Loss Contingency, Range of Possible Loss, Minimum |  | $ 1 | $ 1 |
Loss Contingency, Range of Possible Loss, Maximum |  | 53 | 53 |
Indemnification Agreement [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | [1] | $ 27 | $ 27 |
Number of Agreements | agreement | [1] | 1 | 1 |
Loss Contingency, Range of Possible Loss, Minimum | [1] | $ 27 | $ 27 |
Loss Contingency, Range of Possible Loss, Maximum | [1] | 27 | 27 |
Financial Standby Letter of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 82 | $ 82 |
Number of Agreements | agreement |  | 10 | 10 |
Loss Contingency, Range of Possible Loss, Minimum |  | $ 1 | $ 1 |
Loss Contingency, Range of Possible Loss, Maximum |  | 29 | 29 |
Standby Letters of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 32 | $ 32 |
Number of Agreements | agreement |  | 5 | 5 |
Loss Contingency, Range of Possible Loss, Minimum |  | $ 1 | $ 1 |
Loss Contingency, Range of Possible Loss, Maximum |  | $ 15 | $ 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% |  |
[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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