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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Schedule of Repurchase Agreements | The following table summarizes the Company’s Share Repurchase activity (in millions, except per share data):
|  | Twelve months ended December 31
|  | 2018 |  | 2017 (1)
Shares repurchased |  | 10.0 |  |  | 18.0 |
Average price per share |  | $ | 143.94 |  |  | $ | 133.67 |
Costs recorded to retained earnings |  |  |  |
Total repurchase cost |  | $ | 1,447 |  |  | $ | 2,403 |
Additional associated costs |  | 7 |  |  | 12 |
Total costs recorded to retained earnings |  | $ | 1,454 |  |  | $ | 2,415 |
(1) | Included in the 18.0 million shares repurchased during the twelve months ended December 31, 2017 were 0.1 million shares that did not settle until January 2018. These shares were settled at an average price per share of $134.41 and total cost of $15.9 million.
Schedule of components of weighted average number of shares outstanding | Weighted average ordinary shares outstanding are as follows (in millions):
Years ended December 31 | 2018 |  | 2017 |  | 2016
Basic weighted-average ordinary shares outstanding | 245.2 |  |  | 258.5 |  |  | 268.1 |
Dilutive effect of potentially issuable shares | 1.8 |  |  | 2.2 |  |  | 2.2 |
Diluted weighted-average ordinary shares outstanding | 247.0 |  |  | 260.7 |  |  | 270.3 |
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, 2016 | $ | (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 | )
Adoption of new accounting guidance (3) | (1 | ) |  | — |  |  | — |  |  | (1 | )
Balance at January 1, 2018 | (26 | ) |  | (879 | ) |  | (2,592 | ) |  | (3,497 | )
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | (15 | ) |  | (437 | ) |  | (124 | ) |  | (576 | )
Tax benefit (expense) | 18 |  |  | (3 | ) |  | 28 |  |  | 43 |
Other comprehensive income (loss) before reclassifications, net | 3 |  |  | (440 | ) |  | (96 | ) |  | (533 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 11 |  |  | — |  |  | 146 |  |  | 157 |
Tax benefit (expense) | (3 | ) |  | — |  |  | (33 | ) |  | (36 | )
Amounts reclassified from accumulated other comprehensive income (loss), net | 8 |  |  | — |  |  | 113 |  |  | 121 |
Net current period other comprehensive income (loss) | 11 |  |  | (440 | ) |  | 17 |  |  | (412 | )
Balance at December 31, 2018 | $ | (15 | ) |  | $ | (1,319 | ) |  | $ | (2,575 | ) |  | $ | (3,909 | )
(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 “Summary of Significant Accounting Principles and Practices ” for further information.

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