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CONSOLIDATED STATEMENTS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Balance, beginning of period | $ 9,738 | $ 13,195 | $ 12,002
Changes in Accumulated Other Comprehensive Income/(Loss) |  |  |
Total period activity | 65 | 15 | 97
Balance, end of period | 12,810 | 9,738 | 13,195
Derivative Instruments |  |  |
Balance, beginning of period | (258) | (259) | (177)
Changes in Accumulated Other Comprehensive Income/(Loss) |  |  |
Reclassification adjustments | 31 | 11 | 9
Unrealized gain/(loss) on hedges | 19 | (10) | (91)
Total period activity | 50 | 1 | (82)
Balance, end of period | (208) | (258) | (259)
Translation Adjustments |  |  |
Balance, beginning of period | (657) | (674) | (853)
Changes in Accumulated Other Comprehensive Income/(Loss) |  |  |
Currency translation adjustments | 15 | 17 | 179
Total period activity | 15 | 17 | 179
Balance, end of period | (642) | (657) | (674)
Other |  |  |
Balance, beginning of period | (3) |  |
Changes in Accumulated Other Comprehensive Income/(Loss) |  |  |
Other |  | (3) |
Total period activity |  | (3) |
Balance, end of period | (3) | (3) |
Total |  |  |
Balance, beginning of period | (918) | (933) | (1,030)
Changes in Accumulated Other Comprehensive Income/(Loss) |  |  |
Reclassification adjustments | 31 | 11 | 9
Unrealized gain/(loss) on hedges | 19 | (10) | (91)
Currency translation adjustments | 15 | 17 | 179
Other |  | (3) |
Total period activity | 65 | 15 | 97
Balance, end of period | $ (853) | $ (918) | $ (933)

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- Definition Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 + Details
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