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Contingencies and Commitments (Tables) | 3 Months Ended
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Mar. 31, 2012
Contingencies And Commitments Tables [Abstract] |
Contingent Contractual Obligations |
Contingent contractual obligations |  | Amount |  | Number of Agreements |  | Maximum Exposure Range for Each Agreement
|  | (in millions) |  |  |  | (in millions)
Guarantees |  | $ | 352 |  | 21 |  | <$1 - $53
Letters of credit under the senior secured credit facility |  |  | 12 |  | 11 |  | <$1 - $7
Cash collateralized letters of credit |  |  | 254 |  | 13 |  | <$1 - $215
Total |  | $ | 618 |  | 45 |  |

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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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