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Postretirement benefits Schedule of net periodic benefit costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Amount Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss), before Tax [Abstract]      
Total (increase) decrease in other comprehensive (Income) Loss $ (545) $ (15) $ (2)
Pension Plan [Member]      
Amount Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss), before Tax [Abstract]      
Service Cost 93 6 6
Interest Cost 133 21 25
Expected Return on Plan Assets (204) (29) (30)
Amortization of (Gains) Losses 2 2 2
Amortization of Prior Service Cost (Credit) (1)    
Recognized Net (Gain) Loss Due to Curtailments (117)    
Recognized Net (Gain) Loss Due to Settlements (1) 1  
Net Periodic Benefit Cost (95) 1 3
(Increase) decrease in Other Comprehensive Income (Loss), Net Actuarial (Gain) Loss) (277) (16) (10)
(Increase) decrease Other Comprehensive Income (Loss), Net Prior Service Cost (Benefit) (8) 1 8
(Increase) decrease in other comprehensive income, curtailment 117    
(Increase) decrease in other comprehensive income, settlement 1    
Total (increase) decrease in other comprehensive (Income) Loss (167) (15) (2)
Pension Plan [Member] | UNITED STATES      
Amount Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss), before Tax [Abstract]      
Service Cost 75 0 0
Interest Cost 103 0 0
Expected Return on Plan Assets (165) 0 0
Amortization of (Gains) Losses 0 0 0
Amortization of Prior Service Cost (Credit) 0    
Recognized Net (Gain) Loss Due to Curtailments (117)    
Recognized Net (Gain) Loss Due to Settlements (2) 0  
Net Periodic Benefit Cost (106) 0 0
(Increase) decrease in Other Comprehensive Income (Loss), Net Actuarial (Gain) Loss) (326) 0 0
(Increase) decrease Other Comprehensive Income (Loss), Net Prior Service Cost (Benefit) 0 0 0
(Increase) decrease in other comprehensive income, curtailment 117    
(Increase) decrease in other comprehensive income, settlement 2    
Total (increase) decrease in other comprehensive (Income) Loss (207) 0 0
Pension Plan [Member] | Non-US [Member]      
Amount Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss), before Tax [Abstract]      
Service Cost 18 6 6
Interest Cost 30 21 25
Expected Return on Plan Assets (39) (29) (30)
Amortization of (Gains) Losses 2 2 2
Amortization of Prior Service Cost (Credit) (1)    
Recognized Net (Gain) Loss Due to Curtailments 0    
Recognized Net (Gain) Loss Due to Settlements 1 1  
Net Periodic Benefit Cost 11 1 3
(Increase) decrease in Other Comprehensive Income (Loss), Net Actuarial (Gain) Loss) 49 (16) (10)
(Increase) decrease Other Comprehensive Income (Loss), Net Prior Service Cost (Benefit) (8) 1 8
(Increase) decrease in other comprehensive income, curtailment 0    
(Increase) decrease in other comprehensive income, settlement (1)    
Total (increase) decrease in other comprehensive (Income) Loss 40 (15) (2)
Other Postretirement Benefit Plan [Member]      
Amount Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss), before Tax [Abstract]      
Service Cost 10 1 1
Interest Cost 17 0 0
Expected Return on Plan Assets (8) 0 0
Amortization of (Gains) Losses (1) (1) 1
Amortization of Prior Service Cost (Credit) (15)    
Recognized Net (Gain) Loss Due to Curtailments 0    
Recognized Net (Gain) Loss Due to Settlements 0 0  
Net Periodic Benefit Cost 3 0 2
(Increase) decrease in Other Comprehensive Income (Loss), Net Actuarial (Gain) Loss) 17 0 0
(Increase) decrease Other Comprehensive Income (Loss), Net Prior Service Cost (Benefit) (395) 0 0
(Increase) decrease in other comprehensive income, curtailment 0    
(Increase) decrease in other comprehensive income, settlement 0    
Total (increase) decrease in other comprehensive (Income) Loss (378) 0 0
Other Postretirement Benefit Plan [Member] | UNITED STATES      
Amount Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss), before Tax [Abstract]      
Service Cost 9 1 1
Interest Cost 16 0 0
Expected Return on Plan Assets (8) 0 0
Amortization of (Gains) Losses (1) (1) 1
Amortization of Prior Service Cost (Credit) (15)    
Recognized Net (Gain) Loss Due to Curtailments 0    
Recognized Net (Gain) Loss Due to Settlements 0 0  
Net Periodic Benefit Cost 1 0 2
(Increase) decrease in Other Comprehensive Income (Loss), Net Actuarial (Gain) Loss) 14 0 0
(Increase) decrease Other Comprehensive Income (Loss), Net Prior Service Cost (Benefit) (395) 0 0
(Increase) decrease in other comprehensive income, curtailment 0    
(Increase) decrease in other comprehensive income, settlement 0    
Total (increase) decrease in other comprehensive (Income) Loss (381) 0 0
Other Postretirement Benefit Plan [Member] | Non-US [Member]      
Amount Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss), before Tax [Abstract]      
Service Cost 1 0 0
Interest Cost 1 0 0
Expected Return on Plan Assets 0 0 0
Amortization of (Gains) Losses 0 0 0
Amortization of Prior Service Cost (Credit) 0    
Recognized Net (Gain) Loss Due to Curtailments 0    
Recognized Net (Gain) Loss Due to Settlements 0 0  
Net Periodic Benefit Cost 2 0 0
(Increase) decrease in Other Comprehensive Income (Loss), Net Actuarial (Gain) Loss) 3 0 0
(Increase) decrease Other Comprehensive Income (Loss), Net Prior Service Cost (Benefit) 0 0 0
(Increase) decrease in other comprehensive income, curtailment 0    
(Increase) decrease in other comprehensive income, settlement 0    
Total (increase) decrease in other comprehensive (Income) Loss $ 3 $ 0 $ 0