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Equity (Tables) | 3 Months Ended
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Mar. 31, 2020
Equity [Abstract] |
Schedule of changes in accumulated other comprehensive loss | Changes in accumulated other comprehensive loss by component, net of tax, were as follows (in millions):
| Three Months Ended March 31,
| 2020 |  | 2019
| Foreign Currency Translation Adjustment |  | Defined Benefit Plans Items |  | Gains (Losses) on Cash Flow Hedges |  | Total |  | Foreign Currency Translation Adjustment |  | Defined Benefit Plans Items |  | Total
Balance as of beginning of period | $ | (676 | ) |  | $ | (672 | ) |  | $ | (3 | ) |  | $ | (1,351 | ) |  | $ | (1,022 | ) |  | $ | (485 | ) |  | $ | (1,507 | )
Other comprehensive income (loss) before reclassifications | (606 | ) |  | — |  |  | 21 |  |  | (585 | ) |  | 153 |  |  | — |  |  | 153 |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 9 |  |  | (10 | ) |  | (1 | ) |  | — |  |  | 2 |  |  | 2 |
Other comprehensive income (loss) | (606 | ) |  | 9 |  |  | 11 |  |  | (586 | ) |  | 153 |  |  | 2 |  |  | 155 |
Balance as of end of period | $ | (1,282 | ) |  | $ | (663 | ) |  | $ | 8 |  |  | $ | (1,937 | ) |  | $ | (869 | ) |  | $ | (483 | ) |  | $ | (1,352 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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