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Contingencies and Commitments (Tables) | 6 Months Ended
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Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract] |
Schedule Of Contingent Contractual Obligations [Table Text Block] | The following table summarizes the Parent Company’s contingent contractual obligations as of June 30, 2018. 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.
Contingent Contractual Obligations |  | Amount (in millions) |  | Number of Agreements |  | Maximum Exposure Range for Individual Agreements (in millions)
Guarantees and commitments |  | $ | 716 |  |  | 21 |  |  | <$1 — 272
Letters of credit under the unsecured credit facility |  | 273 |  |  | 4 |  |  | $2 — 247
Letters of credit under the senior secured credit facility |  | 86 |  |  | 21 |  |  | <$1 — 64
Asset sale related indemnities (1) |  | 27 |  |  | 1 |  |  | $27
Total |  | $ | 1,102 |  |  | 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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