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Postretirement benefits Components of net periodic benefit costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost $ 3 $ 2 $ 5 $ 4
Non-service (benefit) cost (31) (26) (62) (51)
Net periodic benefit cost (benefit) (28) (24) (57) (47)
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 0 0 0 0
Interest cost 0 1 1 1
Expected return on plan assets (1) (1) (2) (2)
Defined Benefit Plan, Amortization of Gain (Loss) 0 0 (1) 0
Amortization of prior service cost 0 0 0 0
Settlements 0 0 0 0
Non-service (benefit) cost (1) 0 (2) (1)
Net periodic benefit cost (benefit) (1) 0 (2) (1)
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 (3) (3) (6) (5)
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 3 2 5 4
Non-service (benefit) cost (28) (23) (56) (46)
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) (1)
Foreign Plan [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 3 2 5 4
Interest cost 9 9 18 18
Expected return on plan assets (12) (13) (25) (25)
Defined Benefit Plan, Amortization of Gain (Loss) 0 0 1 0
Amortization of prior service cost 0 0 0 0
Settlements 0 0 0 0
Non-service (benefit) cost (3) (4) (6) (7)
Net periodic benefit cost (benefit) 0 (2) (1) (3)
UNITED STATES | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 0 0 0 0
Interest cost 34 34 67 68
Expected return on plan assets (61) (56) (122) (112)
Defined Benefit Plan, Amortization of Gain (Loss) (1) 0 (1) 0
Amortization of prior service cost 0 0 0 0
Settlements 0 0 0 0
Non-service (benefit) cost (28) (22) (56) (44)
Net periodic benefit cost (benefit) $ (28) $ (22) $ (56) $ (44)