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Contingencies and Commitments (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) agreement | Jun. 30, 2016 USD ($) agreement | Jun. 30, 2015 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 18 years |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 527 | $ 527 |
No. of Agreements | agreement |  | 39 | 39 |
Loss Contingency Accrual, Period Increase (Decrease) |  |  | $ 21 | $ (134)
Guarantee Obligations [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 416 | $ 416 |
No. of Agreements | agreement |  | 15 | 15 |
Indemnification Agreement [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | [1] | $ 27 | $ 27 |
No. of Agreements | agreement | [1] | 1 | 1 |
Financial Standby Letter of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 7 | $ 7 |
No. of Agreements | agreement |  | 18 | 18 |
Standby Letters of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 2 | $ 2 |
No. of Agreements | agreement |  | 1 | 1 |
Minimum [Member] | Guarantee Obligations [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 1 | $ 1 |
Minimum [Member] | Indemnification Agreement [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss | [1] | 27 | 27 |
Minimum [Member] | Standby Letters of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 3 | 3 |
Letter of credit fee percentage paid |  | 0.20% |  |
Maximum [Member] | Guarantee Obligations [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 53 | 53 |
Maximum [Member] | Indemnification Agreement [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss | [1] | 27 | 27 |
Maximum [Member] | Standby Letters of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 3 | 3 |
Letter of credit fee percentage paid |  | 2.50% |  |
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 75 | $ 75 |
No. of Agreements | agreement |  | 4 | 4 |
Unsecured Debt [Member] | Minimum [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 2 | $ 2 |
Unsecured Debt [Member] | Maximum [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 29 | 29 |
Secured Debt [Member] | Minimum [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 1 | 1 |
Secured Debt [Member] | Maximum [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 1 | $ 1 |
[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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