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Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Pension settlement charge       $ 3
Other Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 0 0
Interest cost 1 1 2 2
Recognized prior service credit (10) (10) (20) (20)
Recognized net loss 1 1 2 2
Net periodic cost (8) (8) (16) (16)
Pension Benefits - U.S. Plans [Member] | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3 3 7 7
Interest cost 13 12 25 25
Expected return on plan assets (20) (22) (41) (45)
Recognized net loss 13 13 26 25
Net periodic cost 9 6 17 12
Pension Benefits - Non-U.S. Plans [Member] | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 5 5 11 11
Interest cost 19 27 38 53
Expected return on plan assets (35) (41) (70) (82)
Recognized prior service credit (3) (3) (6) (6)
Recognized net loss 11 13 21 26
Net periodic cost $ (3) $ 1 $ (6) $ 2