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System Fund - Summary of Liabilities Relating to Fund (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
System fund [line items] |  |  |
Liabilities | $ 4,026 | $ 3,686 |
System fund surplus [member] |  |  |
System fund [line items] |  |  |
Liabilities | 158 |  |
System fund [member] |  |  |
System fund [line items] |  |  |
Liabilities | 918 | 912 | $ 835
System fund [member] | System fund surplus [member] |  |  |
System fund [line items] |  |  |
Liabilities | 158 | 227 | 186
System fund [member] | Loyalty programme liability [member] |  |  |
System fund [line items] |  |  |
Liabilities | $ 760 | $ 685 | $ 649

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- Details
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- Details
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