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Long-Term Commitments (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Schedule of future minimum rental payments for operating leases | At December 31, 2017, the aggregate future minimum rental commitments under all non-cancelable operating lease agreements are as follows:
For the Years Ended December 31, | Gross Rental Commitments |  | Rentals from Subleases |  | Net Rental Commitments
(In millions of dollars) |  |
2018 | $ | 355 |  |  | $ | 41 |  |  | $ | 314 |
2019 | $ | 316 |  |  | $ | 34 |  |  | $ | 282 |
2020 | $ | 291 |  |  | $ | 31 |  |  | $ | 260 |
2021 | $ | 226 |  |  | $ | 3 |  |  | $ | 223 |
2022 | $ | 207 |  |  | $ | 1 |  |  | $ | 206 |
Subsequent years | $ | 773 |  |  | $ | 1 |  |  | $ | 772 |
Future minimum rental commitments | At December 31, 2017, the aggregate fixed future minimum commitments under these agreements are as follows:
For the Years Ended December 31, | Future Minimum Commitments
(In millions of dollars)
2018 | $ | 228 |
2019 | 106 |
2020 | 28 |
Subsequent years | 25 |
| $ | 387 |

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- Definition Tabular disclosure of information about obligations resulting from other commitments. + References No definition available. + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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