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Contingencies and guarantees - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) Lawsuits | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Disclosure of contingent liabilities [line items] |  |  |
Outstanding letters of credit | $ 29,000,000 | $ 35,000,000 |
Guarantees of loans made to equity accounted investments | 43,000,000 | 54,000,000 |
Other contingent liabilities | 0 | 0 |
Maximum [member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Litigation settlement amount | 2,000,000 |  |
Performance guarantees [member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Performance guarantees provided for in the financial statements | 3,000,000 | 6,000,000 |
Maximum unprovided exposure for guarantees | 42,000,000 | 31,000,000 |
Security Incidents [member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Provision | 0 | $ 5,000,000 | $ 5,000,000
Litigation settlement amount | $ 3,000,000 |  |
Number of lawsuits filed againsts group | Lawsuits | 4 |  |
Americas security incident [member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Number of managed properties affected by security incident |  |  | 12

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- Definition The amount of guarantees of loans made to equity accounted investments. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Number of lawsuits filed. + References No definition available. + Details
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- Definition Number of managed properties affected by security incident. + References No definition available. + Details
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