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Significant Accounting Policies - Impact of IFRS 16 on Group Statement of Cash Flows (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year | $ 386 | $ 350 | $ 535
Adjustments reconciling profit for the year to cash flow from operations before contract acquisition costs | 582 | 564 | 371
Cash flow from operations before contract acquisition costs | 968 | 914 | 906
Cash flow from operations | 907 | 860 | 849
Interest paid | (110) | (87) | (87)
Interest received | 3 | 2 | 1
Tax paid on operating activities | (141) | (66) | (147)
Net cash from operating activities | 653 | 709 | 616
Net cash from investing activities | (493) | (197) | (220)
Principal element of lease payments | (59) | (35) | (25)
Other cash flows from financing activities | 127 | (268) | 153
Net cash from financing activities | (660) | 51 | (471)
Net movement in cash and cash equivalents in the year | (500) | 563 | (75)
Cash and cash equivalents at beginning of the year | 600 | 58 | 117
Exchange rate effects | 8 | (21) | 16
Cash and cash equivalents at end of the year | 108 | 600 | 58
Previously reported [member] |  |  |
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year |  | 352 | 541
Adjustments reconciling profit for the year to cash flow from operations before contract acquisition costs |  | 502 | 308
Cash flow from operations before contract acquisition costs |  | 854 | 849
Contract acquisition costs, net of repayments |  | (54) | (57)
Cash flow from operations |  | 800 | 792
Interest paid |  | (70) | (69)
Interest received |  | 2 | 1
Tax paid on operating activities |  | (66) | (147)
Net cash from operating activities |  | 666 | 577
Landlord contribution to property, plant and equipment |  | 8 | 14
Other cash flows from investing activities |  | (197) | (220)
Net cash from investing activities |  | (189) | (206)
Other cash flows from financing activities |  | 86 | (446)
Net cash from financing activities |  | 86 | (446)
Net movement in cash and cash equivalents in the year |  | 563 | (75)
Cash and cash equivalents at beginning of the year | 600 | 58 | 117
Exchange rate effects |  | (21) | 16
Cash and cash equivalents at end of the year |  | 600 | 58
Increase (decrease) due to application of IFRS 16 [member] |  |  |
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year |  | (2) | (6)
Adjustments reconciling profit for the year to cash flow from operations before contract acquisition costs |  | 62 | 63
Cash flow from operations before contract acquisition costs |  | 60 | 57
Cash flow from operations |  | 60 | 57
Interest paid |  | (17) | (18)
Net cash from operating activities |  | 43 | 39
Landlord contribution to property, plant and equipment |  | (8) | (14)
Net cash from investing activities |  | (8) | (14)
Principal element of lease payments |  | (35) | (25)
Net cash from financing activities |  | (35) | (25)
Restated [member] |  |  |
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year |  | 350 | 535
Adjustments reconciling profit for the year to cash flow from operations before contract acquisition costs |  | 564 | 371
Cash flow from operations before contract acquisition costs |  | 914 | 906
Contract acquisition costs, net of repayments |  | (54) | (57)
Cash flow from operations |  | 860 | 849
Interest paid |  | (87) | (87)
Interest received |  | 2 | 1
Tax paid on operating activities |  | (66) | (147)
Net cash from operating activities |  | 709 | 616
Other cash flows from investing activities |  | (197) | (220)
Net cash from investing activities |  | (197) | (220)
Principal element of lease payments |  | (35) | (25)
Other cash flows from financing activities |  | 86 | (446)
Net cash from financing activities |  | 51 | (471)
Net movement in cash and cash equivalents in the year |  | 563 | (75)
Cash and cash equivalents at beginning of the year | $ 600 | 58 | 117
Exchange rate effects |  | (21) | 16
Cash and cash equivalents at end of the year |  | $ 600 | $ 58

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