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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost $ 8 $ 10 $ 32 $ 29
Interest cost 35 39 110 148
Expected return on plan assets (38) (43) (119) (173)
Recognized net actuarial loss 13 13 39 61
Settlements 0 19 0 1,348
Other (2) (2) (7) (9)
Net periodic benefit cost 16 36 55 1,404
Other Postretirement Benefit Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service cost 3 3 9 9
Interest cost 7 8 24 25
Expected return on plan assets 0 0 0 0
Recognized net actuarial loss 0 0 (1) (1)
Settlements 0 0 0 0
Other 0 0 0 0
Net periodic benefit cost $ 10 $ 11 $ 32 $ 33