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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018, are payable as follows (in millions):
|  | Capital Lease |  |  | Operating Lease |
|  | Payments |  |  | Payments |
2019 |  | $ | 15 |  |  | $ | 126 |
2020 |  |  | 15 |  |  |  | 106 |
2021 |  |  | 15 |  |  |  | 88 |
2022 |  |  | 15 |  |  |  | 68 |
2023 |  |  | 15 |  |  |  | 51 |
Thereafter |  |  | 262 |  |  |  | 293 |
Total future lease commitments |  | $ | 337 |  |  | $ | 732 |

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