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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Plan      
Net loss      
Balance at beginning of period $ 2,057 $ 2,032 $ 2,320
Reclassification to net periodic benefit cost (134) (95) (114)
Current year loss 103 21 13
Amendments 0 0 0
Foreign currency translation (64) 99 (187)
Balance at end of period 1,962 2,057 2,032
Prior service      
Balance at beginning of period (16) (32) (54)
Reclassification to net periodic benefit cost 10 14 11
Current year loss 0 0 0
Amendments 0 4 3
Foreign currency translation 0 (2) 8
Balance at end of period (6) (16) (32)
Other Postretirement Benefits      
Net loss      
Balance at beginning of period 49 49 47
Reclassification to net periodic benefit cost (4) (4) (5)
Current year loss (14) 4 7
Foreign currency translation 0 0 0
Balance at end of period 31 49 49
Prior service      
Balance at beginning of period (142) (182) (225)
Reclassification to net periodic benefit cost 37 40 41
Current year loss 0 0 0
Foreign currency translation 0 0 2
Balance at end of period $ (105) $ (142) $ (182)