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Employee Postretirement Benefits (Benefit Cost Information For Defined Benefit Plans And Other Postretirement Benefit Plans) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost $ 10 $ 9 $ 24 $ 19
Interest cost 37 45 75 109
Expected return on plan assets (40) (55) (81) (130)
Recognized net actuarial loss 13 19 26 48
Settlements 0 1,320 0 1,329
Other (2) (2) (5) (7)
Net periodic benefit cost 18 1,336 39 1,368
Other Postretirement Benefit Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 3 2 6 6
Interest cost 9 9 17 17
Expected return on plan assets 0 0 0 0
Recognized net actuarial loss (1) (1) (1) (1)
Settlements 0 0 0 0
Other 0 0 0 0
Net periodic benefit cost $ 11 $ 10 $ 22 $ 22