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Shareholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Schedule of Components of Weighted Average Number of Shares | Weighted average ordinary shares outstanding are as follows (in millions):
| Three months ended March 31
| 2018 |  | 2017
Basic weighted average ordinary shares outstanding | 248.5 |  |  | 264.8 |
Dilutive effect of potentially issuable shares | 1.7 |  |  | 2.2 |
Diluted weighted average ordinary shares outstanding | 250.2 |  |  | 267.0 |
Components of Accumulated Other Comprehensive Loss, Net of Related Tax | Changes in Accumulated other comprehensive loss by component, net of related tax, are as follows (in millions):
| Change in Fair Value of Financial Instruments (1) |  | Foreign Currency Translation Adjustments |  | Post-Retirement Benefit Obligation (2) |  | Total
Balance at December 31, 2017 | $ | (25 | ) |  | $ | (879 | ) |  | $ | (2,592 | ) |  | $ | (3,496 | )
Adoption of new accounting guidance (3) | (1 | ) |  | — |  |  | — |  |  | (1 | )
Balance at January 1, 2018 | (26 | ) |  | (879 | ) |  | (2,592 | ) |  | (3,497 | )
Other comprehensive income before reclassifications, net | 11 |  |  | 244 |  |  | 22 |  |  | 277 |
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income | 4 |  |  | — |  |  | 34 |  |  | 38 |
Tax expense | (1 | ) |  | — |  |  | (8 | ) |  | (9 | )
Amounts reclassified from accumulated other comprehensive income, net | 3 |  |  | — |  |  | 26 |  |  | 29 |
Net current period other comprehensive income | 14 |  |  | 244 |  |  | 48 |  |  | 306 |
Balance at March 31, 2018 | $ | (12 | ) |  | $ | (635 | ) |  | $ | (2,544 | ) |  | $ | (3,191 | )
(1) | Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income (expense), Other general expenses, and Compensation and benefits. See Note 15 “Derivatives and Hedging” for additional information regarding the Company’s derivative and hedging activity.
(2) | Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income (expense).
(3) | Refer to Note 2 “Accounting Principles and Practices” for further information.

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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