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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Schedule of components of weighted average number of shares outstanding | Weighted average shares outstanding are as follows (in millions):
| Year ended December 31,
| 2016 |  | 2015 |  | 2014
Basic weighted-average ordinary shares outstanding | 268.1 |  |  | 280.8 |  |  | 295.5 |
Dilutive effect of potentially issuable shares | 2.2 |  |  | 3.0 |  |  | 4.1 |
Diluted weighted-average ordinary shares outstanding | 270.3 |  |  | 283.8 |  |  | 299.6 |
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 January 1, 2014 | $ | (21 | ) |  | $ | 169 |  |  | $ | (2,522 | ) |  | $ | (2,374 | )
Other comprehensive loss before reclassifications: |  |  |  |  |  |  |
Other comprehensive loss before reclassifications | (13 | ) |  | (492 | ) |  | (563 | ) |  | (1,068 | )
Tax benefit | 4 |  |  | (12 | ) |  | 229 |  |  | 221 |
Other comprehensive loss before reclassifications, net | (9 | ) |  | (504 | ) |  | (334 | ) |  | (847 | )
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 20 |  |  | — |  |  | 106 |  |  | 126 |
Tax benefit | (7 | ) |  | — |  |  | (32 | ) |  | (39 | )
Amounts reclassified from accumulated other comprehensive loss, net | 13 |  |  | — |  |  | 74 |  |  | 87 |
Net current period other comprehensive (loss) income | 4 |  |  | (504 | ) |  | (260 | ) |  | (760 | )
Balance at December 31, 2014 | (17 | ) |  | (335 | ) |  | (2,782 | ) |  | (3,134 | )
Other comprehensive loss before reclassifications: |  |  |  |  |  |  |
Other comprehensive loss before reclassifications | (4 | ) |  | (467 | ) |  | 82 |  |  | (389 | )
Tax benefit | 1 |  |  | 31 |  |  | (9 | ) |  | 23 |
Other comprehensive loss before reclassifications, net | (3 | ) |  | (436 | ) |  | 73 |  |  | (366 | )
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 11 |  |  | — |  |  | 117 |  |  | 128 |
Tax benefit | (16 | ) |  | — |  |  | (35 | ) |  | (51 | )
Amounts reclassified from accumulated other comprehensive loss, net | (5 | ) |  | — |  |  | 82 |  |  | 77 |
Net current period other comprehensive (loss) income | (8 | ) |  | (436 | ) |  | 155 |  |  | (289 | )
Balance at December 31, 2015 | (25 | ) |  | (771 | ) |  | (2,627 | ) |  | (3,423 | )
Other comprehensive loss before reclassifications: |  |  |  |  |  |  |
Other comprehensive loss before reclassifications | (25 | ) |  | (490 | ) |  | (276 | ) |  | (791 | )
Tax benefit | 6 |  |  | (3 | ) |  | 74 |  |  | 77 |
Other comprehensive loss before reclassifications, net | (19 | ) |  | (493 | ) |  | (202 | ) |  | (714 | )
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 10 |  |  | — |  |  | 322 |  |  | 332 |
Tax benefit | (3 | ) |  | — |  |  | (104 | ) |  | (107 | )
Amounts reclassified from accumulated other comprehensive loss, net | 7 |  |  | — |  |  | 218 |  |  | 225 |
Net current period other comprehensive (loss) income | (12 | ) |  | (493 | ) |  | 16 |  |  | (489 | )
Balance at December 31, 2016 | $ | (37 | ) |  | $ | (1,264 | ) |  | $ | (2,611 | ) |  | $ | (3,912 | )
(1) | Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income
(2) | Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Compensation and benefits

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