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Postretirement benefits Schedule of amounts recognized in AOCI on a pretax basis (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Pension Plan [Member] | UNITED STATES    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial loss (gain) $ (207) $ 0
Prior Service Cost 0 0
Total (207) 0
Pension Plan [Member] | Non-US [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial loss (gain) 156 107
Prior Service Cost (2) 7
Total 154 $ 114
Other Postretirement Benefit Plan [Member] | UNITED STATES    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial loss (gain) 14  
Prior Service Cost (395)  
Total (381)  
Other Postretirement Benefit Plan [Member] | Non-US [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial loss (gain) 3  
Prior Service Cost 0  
Total $ 3