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Payroll, staff and employee benefits obligations - Recognized in income and comprehensive income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Actuarial (Gains) Losses      
Benefit amounts recognized on Equity $ (574) $ (1,035) $ 212
Pension benefits      
Employee benefits obligations      
Current service cost 202 247 244
Past service cost 27 (197)  
Settlements 7 3 (7)
Net interest cost 5 18 25
Benefit amounts recognized on Profit & Loss 241 71 262
Actuarial (Gains) Losses      
Effect of changes in demographic assumptions 1 (71) (12)
Effect of changes in financial assumptions (2,617) (450) 773
Effect of experience adjustments 111 (214) 57
Actual return on plan assets 2,083 (294) (517)
Effect of asset ceiling 3 5  
Benefit amounts recognized on Equity (419) (1,024) 301
TOTAL BENEFIT AMOUNTS RECOGNIZED ON COMPREHENSIVE INCOME (178) (953) 563
Other benefits      
Employee benefits obligations      
Current service cost 15 17 19
Past service cost 9 (1)  
Settlements     (3)
Net interest cost 12 8 11
Benefit amounts recognized on Profit & Loss 36 24 27
Actuarial (Gains) Losses      
Effect of changes in demographic assumptions (9) (8) (3)
Effect of changes in financial assumptions (138) 2 (1)
Effect of experience adjustments (8) (5) (85)
Benefit amounts recognized on Equity (155) (11) (89)
TOTAL BENEFIT AMOUNTS RECOGNIZED ON COMPREHENSIVE INCOME $ (119) $ 13 $ (62)