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Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
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):
| Nine Months Ended September 30,
| 2018 |  | 2017
| Foreign Currency Translation Adjustment |  | Defined Benefit Plans Items |  | Total |  | Foreign Currency Translation Adjustment |  | Defined Benefit Plans Items |  | Total
Balance as of beginning of period | $ | (507 | ) |  | $ | (433 | ) |  | $ | (940 | ) |  | $ | (1,021 | ) |  | $ | (389 | ) |  | $ | (1,410 | )
Other comprehensive income (loss) before reclassifications | (224 | ) |  | — |  |  | (224 | ) |  | 509 |  |  | — |  |  | 509 |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 20 |  |  | 20 |  |  | — |  |  | 8 |  |  | 8 |
Other comprehensive income (loss) | (224 | ) |  | 20 |  |  | (204 | ) |  | 509 |  |  | 8 |  |  | 517 |
Reclassification of stranded income tax effects of Tax Reform to retained earnings per ASU 2018-02 (see Note 1) | — |  |  | (91 | ) |  | (91 | ) |  | — |  |  | — |  |  | — |
Balance as of end of period | $ | (731 | ) |  | $ | (504 | ) |  | $ | (1,235 | ) |  | $ | (512 | ) |  | $ | (381 | ) |  | $ | (893 | )

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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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