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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)

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