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Postretirement benefits Components of net periodic benefit costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost $ 2 $ 1 $ 6 $ 3
Non-service (benefit) cost (22) (55) (73) (164)
Net periodic benefit cost (benefit) (20) (54) (67) (161)
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 0 0 0 0
Interest cost 1 0 2 1
Expected return on plan assets 0 0 (2) (1)
Defined Benefit Plan, Amortization of Gain (Loss) (1) 0 (1) 0
Amortization of prior service cost (1) 0 (1) 0
Settlements 0 0 0 0
Non-service (benefit) cost (1) 0 (2) 0
Net periodic benefit cost (benefit) (1) 0 (2) 0
Losses and loss expenses | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 0 0 0 0
Non-service (benefit) cost (1) (5) (6) (15)
Losses and loss expenses | Other Postretirement Benefits Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 0 0 0 0
Non-service (benefit) cost 0 0 0 0
Administrative Expense | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 2 1 6 3
Non-service (benefit) cost (21) (50) (67) (149)
Administrative Expense | Other Postretirement Benefits Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 0 0 0 0
Non-service (benefit) cost (1) 0 (2) 0
Foreign Plan [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 2 1 6 3
Interest cost 9 5 27 17
Expected return on plan assets (13) (11) (38) (33)
Defined Benefit Plan, Amortization of Gain (Loss) 0 0 0 0
Amortization of prior service cost 0 0 0 0
Settlements 0 0 0 0
Non-service (benefit) cost (4) (6) (11) (16)
Net periodic benefit cost (benefit) (2) (5) (5) (13)
UNITED STATES | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 0 0 0 0
Interest cost 35 21 103 64
Expected return on plan assets (56) (70) (168) (212)
Defined Benefit Plan, Amortization of Gain (Loss) 0 0 0 0
Amortization of prior service cost 0 0 0 0
Settlements 3 0 3 0
Non-service (benefit) cost (18) (49) (62) (148)
Net periodic benefit cost (benefit) $ (18) $ (49) $ (62) $ (148)