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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)

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