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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Future Minimum Lease Commitments Under Capital Leases and Noncancellable Operating Leases with Initial or Remaining Terms of One Year or More | Future minimum lease commitments under capital leases and noncancellable operating leases with initial or remaining terms of one year or more at December 31, 2017, are payable as follows (in millions):
|  | Capital Lease Payments |  |  | Operating Lease Payments |
2018 |  | $ | 15 |  |  | $ | 130 |
2019 |  |  | 15 |  |  |  | 98 |
2020 |  |  | 15 |  |  |  | 82 |
2021 |  |  | 15 |  |  |  | 67 |
2022 |  |  | 15 |  |  |  | 55 |
Thereafter |  |  | 273 |  |  |  | 339 |
Total future lease commitments |  | $ | 348 |  |  | $ | 771 |

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