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CONSOLIDATED STATEMENTS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Total period activity | $ (260) | $ 239 | $ 72
Derivative Instruments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (223) | (228) | (203)
Reclassification adjustments | 8 | 21 | 8
Unrealized gain/(loss) on hedges | 38 | (16) | (33)
Total period activity | 46 | 5 | (25)
Ending balance | (177) | (223) | (228)
Translation Adjustments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (548) | (782) | (878)
Currency translation adjustments | (305) | 234 | 96
Total period activity | (305) | 234 | 96
Ending balance | (853) | (548) | (782)
Other |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 1 | 1 | 0
Other | (1) |  | 1
Total period activity | (1) | 0 | 1
Ending balance | 0 | 1 | 1
Total |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (770) | (1,009) | (1,081)
Reclassification adjustments | 8 | 21 | 8
Unrealized gain/(loss) on hedges | 38 | (16) | (33)
Currency translation adjustments | (305) | 234 | 96
Other | (1) |  | 1
Total period activity | (260) | 239 | 72
Ending balance | $ (1,030) | $ (770) | $ (1,009)

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- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,c) -URI http://asc.fasb.org/extlink&oid=109240241&loc=d3e32211-110900 + Details
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