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Pension, Savings and Other Postretirement Benefit Plans - Defined Benefit Pension Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
U.S.        
Defined Benefit Plan, Net Periodic Benefit Cost        
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost 39 41 79 81
Expected return on plan assets (54) (61) (109) (121)
Amortization of net losses 28 28 56 56
Net periodic pension cost 14 9 28 18
Net curtailments/settlements/termination benefits 3 1 3 1
Total defined benefit pension cost 17 10 31 19
Non-U.S.        
Defined Benefit Plan, Net Periodic Benefit Cost        
Service cost 7 8 14 15
Interest cost 17 18 35 35
Expected return on plan assets (18) (20) (36) (39)
Amortization of net losses 8 8 15 16
Net periodic pension cost $ 14 $ 14 $ 28 $ 27