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Postretirement benefits Components of net periodic benefit costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost $ 2 $ 2 $ 7 $ 6
Non-service (benefit) cost (31) (22) (93) (73)
Net periodic benefit cost (benefit) (29) (20) (86) (67)
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 0 0 0 0
Interest cost 0 1 1 2
Expected return on plan assets 0 0 (2) (2)
Defined Benefit Plan, Amortization of Gain (Loss) (1) (1) (2) (1)
Amortization of prior service cost 0 (1) 0 (1)
Settlements 0 0 0 0
Non-service (benefit) cost (1) (1) (3) (2)
Net periodic benefit cost (benefit) (1) (1) (3) (2)
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) (1) (9) (6)
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 2 7 6
Non-service (benefit) cost (28) (21) (84) (67)
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) (1) (3) (2)
Foreign Plan [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 2 2 7 6
Interest cost 9 9 27 27
Expected return on plan assets (13) (13) (38) (38)
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 (4) (4) (10) (11)
Net periodic benefit cost (benefit) (2) (2) (3) (5)
UNITED STATES | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 0 0 0 0
Interest cost 33 35 100 103
Expected return on plan assets (61) (56) (183) (168)
Defined Benefit Plan, Amortization of Gain (Loss) 0 0 (1) 0
Amortization of prior service cost 0 0 0 0
Settlements 1 3 1 3
Non-service (benefit) cost (27) (18) (83) (62)
Net periodic benefit cost (benefit) $ (27) $ (18) $ (83) $ (62)