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Equity (Tables) | 3 Months Ended
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Mar. 31, 2019
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,
| 2019 |  | 2018
| Foreign Currency Translation Adjustment |  | Defined Benefit Plans Items |  | Total |  | Foreign Currency Translation Adjustment |  | Defined Benefit Plans Items |  | Total
Balance as of beginning of period | $ | (1,022 | ) |  | $ | (485 | ) |  | $ | (1,507 | ) |  | $ | (507 | ) |  | $ | (433 | ) |  | $ | (940 | )
Other comprehensive income before reclassifications | 153 |  |  | — |  |  | 153 |  |  | 42 |  |  | — |  |  | 42 |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 2 |  |  | 2 |  |  | — |  |  | 6 |  |  | 6 |
Other comprehensive income | 153 |  |  | 2 |  |  | 155 |  |  | 42 |  |  | 6 |  |  | 48 |
Reclassification of stranded income tax effects of Tax Reform to retained earnings | — |  |  | — |  |  | — |  |  | — |  |  | (91 | ) |  | (91 | )
Balance as of end of period | $ | (869 | ) |  | $ | (483 | ) |  | $ | (1,352 | ) |  | $ | (465 | ) |  | $ | (518 | ) |  | $ | (983 | )

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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=114867106&loc=SL7669686-108580 + Details
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