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Operating Lease Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Finance Lease And Operating Lease By Lessor [Abstract] |
Future Aggregate Minimum Lease Payments Under Non-cancellable Operating Leases | The future aggregate minimum lease payments under non-cancellable operating leases are as follows:
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Within one year |  | $ | 2,811 |  |  | $ | 2,918 |
Longer than one year but within five years |  |  | 5,450 |  |  |  | 5,796 |
Longer than five years |  |  | 960 |  |  |  | 779 |
|  | $ | 9,221 |  |  | $ | 9,493 |
Future Aggregate Minimum Lease Collection Under Non-cancellable Operating Leases | The future aggregate minimum lease collection under non-cancellable operating leases are as follows:
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Within one year |  | $ | 427 |  |  | $ | 353 |
Longer than one year but within five years |  |  | 600 |  |  |  | 659 |
Longer than five years |  |  | 321 |  |  |  | 243 |
|  | $ | 1,348 |  |  | $ | 1,255 |

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- Definition The disclosure of finance leases and operating leases by the lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2016-01-13 -Paragraph 31 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2016-03-30&anchor=para_31&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2016-01-13 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2016-03-30&anchor=para_35&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The disclosure of finance leases and operating leases by the lessor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2016-01-13 -Paragraph 47 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2016-03-30&anchor=para_47&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2016-01-13 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2016-03-30&anchor=para_56&doctype=Standard -URIDate 2016-03-31 + Details
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