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Leases - Additional Information (Detail) € in Millions, £ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) Leases | Dec. 31, 2019 EUR (€) Leases | Dec. 31, 2019 GBP (£) Leases | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disclosure Of Information Leases [Line Items] |  |  |  |  |
Cash payments leases | $ 159 |  |  | $ 132 | $ 87
Weighted average remaining lease term | 42 years | 42 years | 42 years |  |
Percentage of right of use assets value | 91.00% |  |  |  |
Cash payments leases-financing activities | $ 59 |  |  | 35 | 25
Cash payments leases-operating activities | 100 |  |  | 97 | 62
Variable lease payments not included in measurement of lease liabilities | 58 |  |  | 48 | 30
Undiscounted cash flows | 3 |  |  | 1 |
Undiscounted rent payable amount | 3,857 |  |  | 3,891 |
Depreciation,right of use assets | 38 |  |  | 35 | 34
Impairment charges right of use assets | $ 32 |  |  |  |
Eight Priority Leases [member] |  |  |  |  |
Disclosure Of Information Leases [Line Items] |  |  |  |  |
Number of top leases | Leases | 10 |  |  |  |
Number of leases having extension option not included in calculation | Leases | 2 | 2 | 2 |  |
Undiscounted rent payable amount | $ 525 |  |  |  |
Lease Period Extension [member] |  |  |  |  |
Disclosure Of Information Leases [Line Items] |  |  |  |  |
Number of top leases | Leases | 2 |  |  |  |
Later than five years [member] |  |  |  |  |
Disclosure Of Information Leases [Line Items] |  |  |  |  |
Undiscounted cash flows receivable | $ 3 |  |  | 3 | 4
Undiscounted rent payable amount | 3,451 |  |  | 3,479 |
UK Portfolio [member] |  |  |  |  |
Disclosure Of Information Leases [Line Items] |  |  |  |  |
Cash payments leases-financing activities | $ 17 |  |  | 3 |
Variable lease payments not included in measurement of lease liabilities | £ |  |  | £ 46 |  |
Lease term remaining | 24 years | 24 years | 24 years |  |
UK Portfolio [member] | Right-of-use assets [member] |  |  |  |  |
Disclosure Of Information Leases [Line Items] |  |  |  |  |
Impairment charges right of use assets | $ 32 |  |  |  |
German Hotels [member] | Next Five Years [member] |  |  |  |  |
Disclosure Of Information Leases [Line Items] |  |  |  |  |
Variable lease payments not included in measurement of lease liabilities | € |  | € 16 |  |  |
German Hotels [member] | Next Six to Thirty Years [member] |  |  |  |  |
Disclosure Of Information Leases [Line Items] |  |  |  |  |
Variable lease payments not included in measurement of lease liabilities | € |  | € 10 |  |  |
Fixed Lease Payment Guaranteed [member] |  |  |  |  |
Disclosure Of Information Leases [Line Items] |  |  |  |  |
Cash payments leases-financing activities | 26 |  |  | 3 |
Depreciation,right of use assets | $ 3 |  |  | $ 2 | $ 1
Bottom of range [member] |  |  |  |  |
Disclosure Of Information Leases [Line Items] |  |  |  |  |
Lease Term | 1 year | 1 year | 1 year |  |
Top of range [member] |  |  |  |  |
Disclosure Of Information Leases [Line Items] |  |  |  |  |
Lease Term | 99 years | 99 years | 99 years |  |

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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_g&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of the expense relating to variable lease payments not included in the measurement of lease liabilities. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of contractual undiscounted cash flows in relation to lease liabilities before deducting finance charges. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 58 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_58&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph B11D -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_B11D_a&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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- Definition The amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 126 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_126_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 129 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_129_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The cash outflow for operating activities that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 14 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_14&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_17_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of undiscounted finance lease payments to be received. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 94 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_94&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Disclosure Of Information Leases + References No definition available. + Details
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- Definition Number of leases having extension option not included in calculation. + References No definition available. + Details
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- Definition Undiscounted operating lease payments. + References No definition available. + Details
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