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Consolidated Statements of Changes in Stockholders' Equity (USD $) In Millions | Total | Common Stock | Treasury Stock | Paid-in Capital | Retained Earning | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2009 | $ 910 | $ 2 | $ (311) | $ 622 | $ 583 | $ 14
Beginning Balance (in shares) at Dec. 31, 2009 |  | 183 | (14) |  |  |
Net income | 301 |  |  |  | 301 |
Employee stock compensation, employee stock purchase programs and option exercises (in shares) |  | 2 |  |  |  |
Employee stock compensation, employee stock purchase programs and option exercises | 58 |  |  | 58 |  |
Income tax benefit from stock compensation plans | 10 |  |  | 10 |  |
Purchases of treasury stock, not retired (in shares) |  |  | (3) |  |  |
Purchases of treasury stock, not retired | (88) |  | (88) |  |  |
Pension and post-employment benefit plans, net of tax | 1 |  |  |  |  | 1
Currency translation adjustment | (3) |  |  |  |  | (3)
Ending Balance at Dec. 31, 2010 | 1,189 | 2 | (399) | 690 | 884 | 12
Ending Balance (in shares) at Dec. 31, 2010 |  | 185 | (17) |  |  |
Net income | 353 |  |  |  | 353 |
Employee stock compensation, employee stock purchase programs and option exercises (in shares) |  | 2 |  |  |  |
Employee stock compensation, employee stock purchase programs and option exercises | 60 |  |  | 60 |  |
Income tax benefit from stock compensation plans | 15 |  |  | 15 |  |
Purchases of treasury stock, not retired (in shares) |  |  | (2) |  |  |
Purchases of treasury stock, not retired | (127) |  | (127) |  |  |
Pension and post-employment benefit plans, net of tax | 10 |  |  |  |  | 10
Currency translation adjustment | (6) |  |  |  |  | (6)
Ending Balance at Dec. 31, 2011 | 1,494 | 2 | (526) | 765 | 1,237 | 16
Ending Balance (in shares) at Dec. 31, 2011 |  | 187 | (19) |  |  |
Net income | 419 |  |  |  | 419 |
Employee stock compensation, employee stock purchase programs and option exercises (in shares) |  | 3 |  |  |  |
Employee stock compensation, employee stock purchase programs and option exercises | 95 |  |  | 95 |  |
Income tax benefit from stock compensation plans | 38 |  |  | 38 |  |
Purchases of treasury stock, not retired (in shares) |  |  | (5) |  |  |
Purchases of treasury stock, not retired | (280) |  | (280) |  |  |
Pension and post-employment benefit plans, net of tax | 4 |  |  |  |  | 4
Currency translation adjustment | 9 |  |  |  |  | 9
Ending Balance at Dec. 31, 2012 | $ 1,779 | $ 2 | $ (806) | $ 898 | $ 1,656 | $ 29
Ending Balance (in shares) at Dec. 31, 2012 |  | 190 | (24) |  |  |

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