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Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Contingent Contractual Obligations | The following table summarizes the Parent Company's contingent contractual obligations as of December 31, 2017. Amounts presented in the following table represent the Parent Company's current undiscounted exposure to guarantees and the range of maximum undiscounted potential exposure. The maximum exposure is not reduced by the amounts, if any, that could be recovered under the recourse or collateralization provisions in the guarantees. There were no obligations made by the Parent Company for the direct benefit of the lenders associated with the non-recourse debt of its businesses.
Contingent Contractual Obligations |  | Amount (in millions) |  | Number of Agreements |  | Maximum Exposure Range for Each Agreement (in millions)
Guarantees and commitments |  | $ | 815 |  |  | 21 |  | $1 — 272
Letters of credit under the unsecured credit facility |  | 52 |  |  | 4 |  | $2 — 26
Asset sale related indemnities (1) |  | 27 |  |  | 1 |  | 27
Letters of credit under the senior secured credit facility |  | 36 |  |  | 21 |  | <$1 — 13
Total |  | $ | 930 |  |  | 47 |  |
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(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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- Definition Provides pertinent information about guarantee obligations and letters of credit issued, or each group of similar obligations, including the maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee. + References No definition available. + Details
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