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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2016
Shareholders' Equity |
Changes in accumulated other comprehensive loss | The changes in accumulated other comprehensive loss, presented net of tax, which resulted from components of net periodic benefit costs for our defined benefit plans, were as follows (in millions):
|  | Three months ended |  | Nine months ended |
|  | September 30, |  | September 30, |
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |
Balance, beginning of period |  | $ | (343) |  | $ | (410) |  | $ | (334) |  | $ | (404) |
Other comprehensive income (loss) before reclassifications |  |  | 8 |  |  | 33 |  |  | (2) |  |  | 22 |
Reclassifications to net income |  |  | 8 |  |  | 9 |  |  | 9 |  |  | 14 |
Other comprehensive income, net |  |  | 16 |  |  | 42 |  |  | 7 |  |  | 36 |
Balance, end of period |  | $ | (327) |  | $ | (368) |  | $ | (327) |  | $ | (368) |

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