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General Information - Impact of IFRS 15 on Group Statement of Cash Flows (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year | $ 352 | $ 541 | $ 459
Adjustments reconciling profit for the year to cash flow from operations before contract acquisition costs | 502 | 308 | 491
Cash flow from operations before contract acquisition costs | 854 | 849 | 950
Contract acquisition costs, net of repayments | (58) | (57) |
Cash flow from operations | 800 | 792 | 908
Interest paid | (70) | (69) | (72)
Interest received | 2 | 1 | 4
Tax paid on operating activities | (66) | (147) | (130)
Net cash from operating activities | 666 | 577 | 710
Purchase of intangible assets | (112) | (172) | (130)
Other cash flows from investing activities |  | (34) |
Net cash from investing activities | (189) | (206) | (174)
Net cash from financing activities | 86 | (446) | (1,456)
Net movement in cash and cash equivalents in the year | 563 | (75) | (920)
Cash and cash equivalents at beginning of the year | 58 | 117 | 1,098
Exchange rate effects | (21) | 16 | (61)
Cash and cash equivalents at end of the year | 600 | 58 | 117
Previously reported [member] |  |  |
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year |  | 593 |
Adjustments reconciling profit for the year to cash flow from operations before contract acquisition costs |  | 263 |
Cash flow from operations before contract acquisition costs |  | 856 |
Cash flow from operations |  | 856 |
Interest paid |  | (76) |
Interest received |  | 1 |
Tax paid on operating activities |  | (147) |
Net cash from operating activities |  | 634 |
Purchase of intangible assets |  | (229) |
Other cash flows from investing activities |  | (34) |
Net cash from investing activities |  | (263) |
Net cash from financing activities |  | (446) |
Net movement in cash and cash equivalents in the year |  | (75) |
Cash and cash equivalents at beginning of the year | $ 58 | 117 |
Exchange rate effects |  | 16 |
Cash and cash equivalents at end of the year |  | 58 | $ 117
Increase (decrease) due to application of IFRS 15 [member] |  |  |
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year |  | (52) |
Adjustments reconciling profit for the year to cash flow from operations before contract acquisition costs |  | 45 |
Cash flow from operations before contract acquisition costs |  | (7) |
Contract acquisition costs, net of repayments |  | (57) |
Cash flow from operations |  | (64) |
Interest paid |  | 7 |
Net cash from operating activities |  | (57) |
Purchase of intangible assets |  | 57 |
Net cash from investing activities |  | $ 57 |

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