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Pension Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
U.S Pension Plans        
Components of net periodic pension cost        
Service cost $ 6 $ 5 $ 18 $ 17
Interest cost 24 27 72 80
Expected asset return (42) (45) (126) (132)
Amortization:        
Actuarial loss 17 19 55 55
Net periodic pension cost 5 6 19 20
Non-U.S. Pension Plans        
Components of net periodic pension cost        
Service cost 5 6 14 20
Interest cost 15 16 39 53
Expected asset return (23) (23) (65) (69)
Amortization:        
Prior service cost   (1)   (2)
Actuarial loss 5 5 15 16
Net periodic pension cost $ 2 $ 3 $ 3 $ 18