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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Changes in Accumulated Other Comprehensive Income/(Loss) |  |  |  |
Total period activity | $ (99) | $ 76 | $ 10 | $ (46)
Derivative Instruments |  |  |  |
Changes in Accumulated Other Comprehensive Income/(Loss) |  |  |  |
Balance at beginning of period |  |  | (177) | (223)
Reclassification adjustments |  |  | 7 | 6
Unrealized gain/(loss) on hedges |  |  | (111) | 60
Total period activity |  |  | (104) | 66
Balance at end of period | (281) | (157) | (281) | (157)
Translation Adjustments |  |  |  |
Changes in Accumulated Other Comprehensive Income/(Loss) |  |  |  |
Balance at beginning of period |  |  | (853) | (548)
Currency translation adjustments |  |  | 113 | (112)
Total period activity |  |  | 113 | (112)
Balance at end of period | (740) | (660) | (740) | (660)
Other |  |  |  |
Changes in Accumulated Other Comprehensive Income/(Loss) |  |  |  |
Balance at beginning of period |  |  |  | 1
Other |  |  | 1 |
Total period activity |  |  | 1 |
Balance at end of period | 1 | 1 | 1 | 1
Total |  |  |  |
Changes in Accumulated Other Comprehensive Income/(Loss) |  |  |  |
Balance at beginning of period |  |  | (1,030) | (770)
Reclassification adjustments |  |  | 7 | 6
Unrealized gain/(loss) on hedges |  |  | (111) | 60
Currency translation adjustments |  |  | 113 | (112)
Other |  |  | 1 |
Total period activity |  |  | 10 | (46)
Balance at end of period | $ (1,020) | $ (816) | $ (1,020) | $ (816)

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