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Share Repurchases (Tables) | 12 Months Ended
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Dec. 31, 2015
Equity [Abstract] |
Schedule of shares repurchased | Shares of treasury stock
Shares and dollars in millions | Shares |  | Amount
Balance at December 31, 2013 | 25.7 |  |  | $ | 610 |
Treasury stock acquired, net of ESPP shares issued | 3.9 |  |  | 102 |
Balance at December 31, 2014 | 29.6 |  |  | 712 |
Treasury stock acquired, net of ESPP shares issued | 3.4 |  |  | 57 |
Balance at December 31, 2015 | 33.0 |  |  | $ | 769 |
The table below presents information on our annual share repurchases activity under these programs:
| Year Ending December 31, 2015
| Number of Shares |  | Average Price per Share |  | Dollars in Millions
Repurchases under the $350 million authorized share repurchase program | 2,992,687 |  |  | $ | 17.43 |  |  | $ | 52 |
Repurchases under the existing share maintenance program | 466,974 |  |  | 15.43 |  |  | 7 |
Withheld to cover shares | 182,964 |  |  | 16.98 |  |  | 3 |
Total | 3,642,625 |  |  | $ | 17.15 |  |  | $ | 62 |
| Year Ending December 31, 2014
| Number of Shares |  | Average Price per Share |  | Dollars in Millions
Repurchases under the $350 million authorized share repurchase program | 3,374,479 |  |  | $ | 26.13 |  |  | $ | 88 |
Repurchases under the existing share maintenance program | 593,042 |  |  | 26.07 |  |  | 16 |
Withheld to cover shares | 73,557 |  |  | 27.69 |  |  | 2 |
Total | 4,041,078 |  |  | $ | 26.15 |  |  | $ | 106 |

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 + Details
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