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Tax - Summary of Deferred Tax (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of income tax reconciliation [line items]    
Beginning balance $ (52) $ (61)
Group income statement 54 3
Assets of businesses acquired   2
Group statement of comprehensive income 15  
Group statement of changes in equity (1)  
Exchange and other adjustments 2 4
Ending balance 18 (52)
Deferred gains on loan notes [member]    
Disclosure of income tax reconciliation [line items]    
Beginning balance (34) (35)
Group income statement   1
Ending balance (34) (34)
Associates [member]    
Disclosure of income tax reconciliation [line items]    
Beginning balance (58) (56)
Group income statement   (2)
Exchange and other adjustments 1  
Ending balance (57) (58)
Losses [member]    
Disclosure of income tax reconciliation [line items]    
Beginning balance 27 35
Group income statement 28 (9)
Group statement of comprehensive income 6  
Exchange and other adjustments   1
Ending balance 61 27
Employee benefits [member]    
Disclosure of income tax reconciliation [line items]    
Beginning balance 33 30
Group income statement   1
Group statement of comprehensive income 1 1
Group statement of changes in equity (1)  
Exchange and other adjustments 1 1
Ending balance 34 33
Deferred compensation [member]    
Disclosure of income tax reconciliation [line items]    
Beginning balance 41 42
Group income statement 1 (1)
Ending balance 42 41
Other short-term temporary differences [member]    
Disclosure of income tax reconciliation [line items]    
Beginning balance [1] 33 31
Group income statement [1] (19) 1
Assets of businesses acquired [1]   2
Group statement of comprehensive income [1] 8 (1)
Exchange and other adjustments [1] (2)  
Ending balance [1] 20 33
Property, plant, equipment and software [member]    
Disclosure of income tax reconciliation [line items]    
Beginning balance (119) (120)
Group income statement 23  
Exchange and other adjustments 1 1
Ending balance (95) (119)
Other intangibles [member]    
Disclosure of income tax reconciliation [line items]    
Beginning balance (14) (18)
Group income statement 14 3
Exchange and other adjustments   1
Ending balance 0 (14)
Application Fees [Member]    
Disclosure of income tax reconciliation [line items]    
Beginning balance 43 43
Group income statement (2)  
Exchange and other adjustments 1  
Ending balance 42 43
Credit Losses [Member]    
Disclosure of income tax reconciliation [line items]    
Beginning balance 12 1
Group income statement 10 11
Ending balance 22 12
Contract Costs [Member]    
Disclosure of income tax reconciliation [line items]    
Beginning balance (16) (14)
Group income statement (1) (2)
Ending balance $ (17) $ (16)
[1] The above table has been re-presented in order to separately disclose the deferred tax on ‘deferred compensation’ and ‘credit losses’ (both previously disclosed in ‘other short-term temporary differences’), to disaggregate the deferred tax on ‘application fees’ and ‘contract costs’, to present deferred tax on share-based compensation within ‘employee benefits’ (previously disclosed within ‘other short-term temporary differences’) and to disclose deferred taxes on ‘contract assets’ within ‘other short-term temporary differences’ (previously disclosed within ‘Other intangible assets and contract assets’).