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Pension Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
UNITED STATES        
Defined Benefit Plan Net Periodic Benefit Cost Abstract        
Service cost $ 3 $ 3 $ 7 $ 6
Interest cost 10 10 20 20
Expected return on plan assets (17) (16) (35) (33)
Amortization of prior service cost 1 2 3 4
Defined Benefit Plan, Amortization of Gain (Loss) (5) (4) (9) (9)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 0 4 0
Total pension cost 2 3 8 6
Defined Benefit Pension Contributions Disclosure [Abstract]        
Pension employer contributions     13  
Pension estimated future employer contributions remainder of fiscal year 1   1  
Foreign Plan [Member]        
Defined Benefit Plan Net Periodic Benefit Cost Abstract        
Service cost 4 3 8 6
Interest cost 97 86 196 163
Expected return on plan assets (72) (55) (145) (105)
Amortization of prior service cost 0 0 0 0
Defined Benefit Plan, Amortization of Gain (Loss) (10) (4) (21) (9)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 0 0 0
Total pension cost 39 $ 38 80 $ 73
Defined Benefit Pension Contributions Disclosure [Abstract]        
Pension employer contributions     79  
Pension estimated future employer contributions remainder of fiscal year $ 76   $ 76