XML 357 R195.htm IDEA: XBRL DOCUMENT v3.22.0.1
Retirement Benefit Obligations - Summary of Impact of Movement in Principal Actuarial Assumptions (Detail) - Plan assets [member] - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Split of scheme assets [line items]      
Total assets $ 3,174 $ 3,321 $ 3,013
Investments quoted in active markets [member] | Equity instruments [member]      
Split of scheme assets [line items]      
Total assets [1] 752 862  
Investments quoted in active markets [member] | Debt Instruments [member]      
Split of scheme assets [line items]      
Total assets [2] 1,874 2,025  
Investments quoted in active markets [member] | Property [member]      
Split of scheme assets [line items]      
Total assets 128 106  
Investments quoted in active markets [member] | Cash and cash equivalents [member]      
Split of scheme assets [line items]      
Total assets 40 56  
Investments quoted in active markets [member] | Investment fund [member]      
Split of scheme assets [line items]      
Total assets 129 166  
Unquoted investments [member]      
Split of scheme assets [line items]      
Total assets 3,174 3,321  
Unquoted investments [member] | Equity instruments [member]      
Split of scheme assets [line items]      
Total assets 2 2  
Unquoted investments [member] | Debt Instruments [member]      
Split of scheme assets [line items]      
Total assets [3] 14 12  
Unquoted investments [member] | Property [member]      
Split of scheme assets [line items]      
Total assets 71 69  
Unquoted investments [member] | Cash and cash equivalents [member]      
Split of scheme assets [line items]      
Total assets 9 6  
Unquoted investments [member] | Assets held by insurance company [member]      
Split of scheme assets [line items]      
Total assets $ 155 $ 17  
[1] Equity instruments primarily relate to developed markets.
[2] Quoted debt instruments are made up of $1,317 million (2020: $1,288 million) and $557 million (2020: $737 million) of government and non-government instruments respectively.
[3] Unquoted debt instruments primarily relate to government debt instruments.