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Postretirement benefits Components of net periodic benefit costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension Plan [Member] | UNITED STATES        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 14 $ 15 $ 43 $ 47
Interest cost 26 27 79 79
Expected return on plan assets (53) (47) (159) (142)
Amortization of net actuarial loss 0 0 0 0
Amortization of prior service cost 0 0 0 0
Curtailments 0 0 0 0
Settlement 0 0 1 0
Net periodic (benefit) cost (13) (5) (36) (16)
Pension Plan [Member] | Non-US [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 3 6 9 14
Interest cost 6 6 20 20
Expected return on plan assets (12) (11) (38) (31)
Amortization of net actuarial loss 1 1 1 2
Amortization of prior service cost 0 0 0 0
Curtailments 0 0 0 (8)
Settlement 0 0 0 0
Net periodic (benefit) cost (2) 2 (8) (3)
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 1 0 1 2
Interest cost 1 2 3 3
Expected return on plan assets (2) (2) (4) (4)
Amortization of net actuarial loss 0 0 0 0
Amortization of prior service cost (21) (22) (64) (68)
Curtailments (1) (32) (2) (32)
Settlement 0 0 0 0
Net periodic (benefit) cost $ (22) $ (54) $ (66) $ (99)