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Stock-Based Compensation (Details 3) - Stock Options - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Stock Options |  |
Vesting period | 5 years |
Expiration period | 10 years |
Shares |  |
Outstanding at the beginning of the period (in shares) | 18,000,000 | 24,000,000
Granted (in shares) | 452,380 |
Exercised (in shares) | 2,000,000 | 2,000,000
Forfeited (in shares) | 2,977,740 |
Modification upon spin off | 2,000,000 |
Outstanding at the end of the period (in shares) | 15,000,000 | 22,000,000
Option shares vested and expected to vest at the end of the period | 15,000,000 | 22,000,000
Option shares exercisable at the end of the period | 13,000,000 | 20,000,000
Weighted average exercise price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 21 | $ 22
Granted (in dollars per share) | 26 | 22
Exercised (in dollars per share) | 16 | 16
Forfeited (in dollars per share) | 29 | 22
Weighted average exercise price | 19 |
Outstanding at the end of the period (in dollars per share) | 18 | 22
Option shares vested and expected to vest at the end of the period (in dollars per share) | 18 | 22
Option shares exercisable at the end of the period (in dollars per share) | $ 18 | $ 23
Aggregate intrinsic value |  |
Exercised | $ 24 | $ 13
Option shares vested and expected to vest at the end of the period | 101 | 88
Option shares exercisable at the end of the period | $ 89 | $ 69
Weighted average remaining option term |  |
Outstanding at the end of the period | 4 years | 4 years
Option shares vested and expected to vest at the end of the period | 4 years | 4 years
Option shares exercisable at the end of the period | 3 years | 3 years
Additional disclosures |  |
Total unrecognized compensation expense | $ 7 | $ 8
Weighted average remaining vesting period | 3 years | 2 years

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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