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Commitments and Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |
Other Commitments | At March 31, 2018, payments under these contracts were estimated as follows:
Year Ending December 31, |  | Commitments
|  | (millions)
Remainder of 2018 |  | $ | 33 |
2019 |  | 36 |
2020 |  | 36 |
2021 |  | 37 |
2022 |  | 37 |
Thereafter |  | 575 |
Total estimated payments |  | $ | 754 |

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- Definition Tabular disclosure of information about obligations resulting from other commitments. + References No definition available. + Details
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