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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule of components of weighted average number of shares outstanding | Weighted average shares outstanding are as follows (in millions):
Years ended December 31 | 2017 |  | 2016 |  | 2015
Basic weighted-average ordinary shares outstanding | 258.5 |  |  | 268.1 |  |  | 280.8 |
Dilutive effect of potentially issuable shares | 2.2 |  |  | 2.2 |  |  | 3.0 |
Diluted weighted-average ordinary shares outstanding | 260.7 |  |  | 270.3 |  |  | 283.8 |
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 |  | Postretirement Benefit Obligation (2) |  | Total
Balance at January 1, 2015 | $ | (17 | ) |  | $ | (335 | ) |  | $ | (2,782 | ) |  | $ | (3,134 | )
Other comprehensive income (loss) before reclassifications: |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | (4 | ) |  | (467 | ) |  | 82 |  |  | (389 | )
Tax benefit (expense) | 1 |  |  | 31 |  |  | (9 | ) |  | 23 |
Other comprehensive income (loss) before reclassifications, net | (3 | ) |  | (436 | ) |  | 73 |  |  | (366 | )
Amounts reclassified from accumulated other comprehensive income (loss): |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 11 |  |  | — |  |  | 117 |  |  | 128 |
Tax benefit (expense) | (16 | ) |  | — |  |  | (35 | ) |  | (51 | )
Amounts reclassified from accumulated other comprehensive income (loss), net | (5 | ) |  | — |  |  | 82 |  |  | 77 |
Net current period other comprehensive income (loss) | (8 | ) |  | (436 | ) |  | 155 |  |  | (289 | )
Balance at December 31, 2015 | (25 | ) |  | (771 | ) |  | (2,627 | ) |  | (3,423 | )
Other comprehensive income (loss) before reclassifications: |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | (25 | ) |  | (490 | ) |  | (276 | ) |  | (791 | )
Tax benefit (expense) | 6 |  |  | (3 | ) |  | 74 |  |  | 77 |
Other comprehensive income (loss) before reclassifications, net | (19 | ) |  | (493 | ) |  | (202 | ) |  | (714 | )
Amounts reclassified from accumulated other comprehensive income (loss): |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 10 |  |  | — |  |  | 322 |  |  | 332 |
Tax benefit (expense) | (3 | ) |  | — |  |  | (104 | ) |  | (107 | )
Amounts reclassified from accumulated other comprehensive income (loss), net | 7 |  |  | — |  |  | 218 |  |  | 225 |
Net current period other comprehensive income (loss) | (12 | ) |  | (493 | ) |  | 16 |  |  | (489 | )
Balance at December 31, 2016 | (37 | ) |  | (1,264 | ) |  | (2,611 | ) |  | (3,912 | )
Other comprehensive income (loss) before reclassifications: |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 18 |  |  | 397 |  |  | (220 | ) |  | 195 |
Tax benefit (expense) | (3 | ) |  | (5 | ) |  | 55 |  |  | 47 |
Other comprehensive income (loss) before reclassifications, net | 15 |  |  | 392 |  |  | (165 | ) |  | 242 |
Amounts reclassified from accumulated other comprehensive income (loss): |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (2 | ) |  | (7 | ) |  | 236 |  |  | 227 |
Tax benefit (expense) | (1 | ) |  | — |  |  | (52 | ) |  | (53 | )
Amounts reclassified from accumulated other comprehensive income (loss), net | (3 | ) |  | (7 | ) |  | 184 |  |  | 174 |
Net current period other comprehensive income (loss) | 12 |  |  | 385 |  |  | 19 |  |  | 416 |
Balance at December 31, 2017 | $ | (25 | ) |  | $ | (879 | ) |  | $ | (2,592 | ) |  | $ | (3,496 | )
(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 14 “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 Compensation and benefits

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