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Pension and Other Postretirement Benefits (Schedule of Changes in Net Loss and Prior Service Cost/(Credit)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Plan [Member]      
Net loss      
Balance at beginning of period $ 2,320 $ 2,423 $ 2,466
Reclassification to net periodic benefit cost (114) (105) (120)
Current year loss/(gain) 13 95 174
Amendments 0 0 0
Foreign currency translation (187) (93) (97)
Balance at end of period 2,032 2,320 2,423
Prior service      
Balance at beginning of period (54) (71) (94)
Reclassification to net periodic benefit cost 11 13 16
Current year loss/(gain) 0 0 0
Amendments 3 0 3
Foreign currency translation 8 4 4
Balance at end of period (32) (54) (71)
Other Postretirement Benefits [Member]      
Net loss      
Balance at beginning of period 47 69 97
Reclassification to net periodic benefit cost (5) (4) (6)
Current year loss/(gain) 7 (18) (24)
Foreign currency translation     2
Balance at end of period 49 47 69
Prior service      
Balance at beginning of period (225) (211) (246)
Reclassification to net periodic benefit cost 41 37 34
Amendments   (51)  
Foreign currency translation 2   1
Balance at end of period $ (182) $ (225) $ (211)