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Employee Benefit Plans (Summary of Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
United States Pension Plans of U S Entity, Defined Benefit [Member]        
Components of Net Periodic Benefit Cost        
Service cost $ 32 $ 31 $ 64 $ 62
Interest cost 29 27 58 54
Expected return on plan assets (32) (35) (64) (70)
Amortization of prior service cost (credit)   1 1 2
Recognized net actuarial loss (gain) 18 18 36 37
Settlements     3 1
Net periodic benefit cost 47 42 98 86
Foreign Pension Plans, Defined Benefit [Member]        
Components of Net Periodic Benefit Cost        
Service cost 9 10 18 20
Interest cost 8 7 15 14
Expected return on plan assets (10) (9) (20) (19)
Amortization of prior service cost (credit) (1) (1) (1) (1)
Recognized net actuarial loss (gain) 3 4 7 8
Net periodic benefit cost 9 11 19 22
Other Postretirement Benefit Plans, Defined Benefit [Member]        
Components of Net Periodic Benefit Cost        
Service cost 2 2 4 4
Interest cost 2 2 4 4
Amortization of prior service cost (credit) (1) (1) (1) (1)
Recognized net actuarial loss (gain)   (1)   (1)
Net periodic benefit cost $ 3 $ 2 $ 7 $ 6