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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension Plan      
Net loss      
Balance at beginning of period $ 2,032 $ 2,320 $ 2,423
Reclassification to net periodic benefit cost (95) (114) (105)
Current year loss/(gain) 21 13 95
Amendments 0 0 0
Foreign currency translation 99 (187) (93)
Balance at end of period 2,057 2,032 2,320
Prior service      
Balance at beginning of period (32) (54) (71)
Reclassification to net periodic benefit cost 14 11 13
Current year loss/(gain) 0 0 0
Amendments 4 3 0
Foreign currency translation (2) 8 4
Balance at end of period (16) (32) (54)
Other Postretirement Benefits      
Net loss      
Balance at beginning of period 49 47 69
Reclassification to net periodic benefit cost (4) (5) (4)
Current year loss/(gain) 4 7 (18)
Amendments 0 0 0
Foreign currency translation 0 0 0
Balance at end of period 49 49 47
Prior service      
Balance at beginning of period (182) (225) (211)
Reclassification to net periodic benefit cost 40 41 37
Current year loss/(gain) 0 0 0
Amendments 0 0 (51)
Foreign currency translation 0 2 0
Balance at end of period $ (142) $ (182) $ (225)