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Postretirement benefits Components of net periodic benefit costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost $ 1 $ 1 $ 3 $ 3
Non-service (benefit) cost (50) (35) (153) (104)
Net periodic benefit cost (benefit) (49) (34) (150) (101)
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 1 0 1 0
Interest cost 1 1 1 2
Expected return on plan assets (1) (1) (1) (3)
Defined Benefit Plan, Amortization of Gain (Loss) 0 0 0 0
Amortization of prior service cost 0 [1] (20) (26) (60)
Settlements 0 0 0 0
Non-service (benefit) cost 0 (20) (26) (61)
Net periodic benefit cost (benefit) 1 (20) (25) (61)
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 (5) (3) (14) (9)
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 (2) (3) (6)
Administrative Expense | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 1 1 3 3
Non-service (benefit) cost (45) (32) (139) (95)
Administrative Expense | Other Postretirement Benefits Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 1 0 1 0
Non-service (benefit) cost 0 (18) (23) (55)
Foreign Plan [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 1 1 3 3
Interest cost 5 6 14 17
Expected return on plan assets (10) (11) (32) (32)
Defined Benefit Plan, Amortization of Gain (Loss) 0 0 2 1
Amortization of prior service cost 0 1 0 1
Settlements 0 0 0 0
Non-service (benefit) cost (5) (4) (16) (13)
Net periodic benefit cost (benefit) (4) (3) (13) (10)
UNITED STATES | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 0 0 0 0
Interest cost 18 24 53 74
Expected return on plan assets (64) (56) (191) (168)
Defined Benefit Plan, Amortization of Gain (Loss) 0 0 0 0
Amortization of prior service cost 0 0 0 0
Settlements 1 1 1 3
Non-service (benefit) cost (45) (31) (137) (91)
Net periodic benefit cost (benefit) $ (45) $ (31) $ (137) $ (91)
[1] At June 30, 2021, the remaining prior service cost amortization related to the 2016 harmonization of our U.S. retirement program was fully amortized. Refer to Note 13 to the Consolidated Financial Statements of our 2020 Form 10-K for additional information.