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Stated Capital - Schedule of Stated Capital (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | May 25, 2017 | May 24, 2017
Disclosure of classes of share capital [line items] |  |  |  |
Stated capital | $ 3,622.5 | $ 3,622.5 |  |
Stated capital | 3,622.5 | 3,622.5 |  |
Authorised |  |  |  | 1,000,000,000
Ordinary Shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Stated capital | 3,622.5 | 3,622.5 |  |
Stated capital | $ 3,622.5 | $ 3,622.5 |  |
In issue at 1 January | 821,532,707 | 821,525,435 |  |
Exercise of employee share options | 0 | 7,272 |  |
In issue at 31 December | 821,532,707 | 821,532,707 |  |
Authorised | 2,000,000,000 | 2,000,000,000 | 2,000,000,000 | 1,000,000,000

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