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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Actuarial (Gains) Losses      
BENEFIT AMOUNTS RECOGNIZED ON EQUITY $ 212 $ 192 $ 12
Pension benefits      
Employee benefits obligations      
Current service cost 244 214 236
Past service cost   4 (1)
Settlements (7) (10) (12)
Net interest cost 25 39 35
BENEFIT AMOUNTS RECOGNIZED ON PROFIT & LOSS 262 247 258
Actuarial (Gains) Losses      
Effect of changes in demographic assumptions (12) (166) (1)
Effect of changes in financial assumptions 773 1,071 (354)
Effect of experience adjustments 57 (59) (17)
Actual return on plan assets (517) (745) 424
Effect of asset ceiling   3 (11)
BENEFIT AMOUNTS RECOGNIZED ON EQUITY 301 104 41
TOTAL BENEFIT AMOUNTS RECOGNIZED ON COMPREHENSIVE INCOME 563 351 299
Other benefits      
Employee benefits obligations      
Current service cost 19 13 14
Past service cost     (2)
Settlements (3) (9)  
Net interest cost 11 17 17
BENEFIT AMOUNTS RECOGNIZED ON PROFIT & LOSS 27 21 29
Actuarial (Gains) Losses      
Effect of changes in demographic assumptions (3) (2) (21)
Effect of changes in financial assumptions (1) 89 (3)
Effect of experience adjustments (85)   (5)
BENEFIT AMOUNTS RECOGNIZED ON EQUITY (89) 87 $ (29)
TOTAL BENEFIT AMOUNTS RECOGNIZED ON COMPREHENSIVE INCOME $ (62) $ 108