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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