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Post-Employment Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Plans        
Defined benefit plan net periodic benefit cost        
Service cost - benefits earned during the period $ 67 $ 68 $ 134 $ 150
Interest cost on projected benefit obligations 73 77 146 156
Expected return on plan assets (143) (128) (284) (257)
Actuarial loss, net 31 42 63 89
Net Cost 28 59 59 138
Net amortization of:        
Company contributions     524 547
Defined Benefit Plans | Discontinued operations        
Defined benefit plan net periodic benefit cost        
Net Cost       1
Defined Benefit Plans | Continuing operations        
Defined benefit plan net periodic benefit cost        
Net Cost 28 59 59 137
Medical and Dental Plans        
Defined benefit plan net periodic benefit cost        
Service cost - benefits earned during the period 6 6 13 15
Interest cost on projected benefit obligations 10 11 22 25
Expected return on plan assets (8) (10) (17) (19)
Actuarial loss, net 3 1 9 10
Prior service cost (credit) $ (11) (12) (22) (24)
Net Cost   (4) 5 7
Net amortization of:        
Company contributions     9 24
Medical and Dental Plans | Continuing operations        
Defined benefit plan net periodic benefit cost        
Net Cost   $ (4) $ 5 $ 7