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Stock-Based Compensation (Details 2) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Options, Beginning balance (in shares) | 8.1 | 12.2
Shares, granted (in shares) |  | 0.8
Shares, exercised (in shares) |  | (4.8)
Shares, cancelled, forfeited and expired (in shares) |  | (0.1)
Options, Ending balance (in shares) |  | 8.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |
Weighted-average exercise price, Beginning balance | $ 45.18 | $ 41.78
Weighted-average exercise price, granted |  | 77.85
Weighted-average exercise price, exercised |  | 72.04
Weighted-average exercise price, cancelled, forfeited and expired |  | 50.96
Weighted-average exercise price, Ending balance |  | $ 45.18
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |
Shares, options exercisable (in shares) |  | 6.5
Weighted-average exercise price, options exercisable |  | $ 40.28
Weighted-average remaining years of contractual term, Options outstanding at December 31, 2014 |  | 4 years 9 months 18 days
Weighted-average remaining years of contractual term, Options exercisable at December 31, 2014 |  | 3 years 9 months 18 days
Aggregate intrinsic value, options outstanding at December 31, 2014 |  | $ 356
Aggregate intrinsic value, options exercisable at December 31, 2014 |  | $ 317
Non Vested Options [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Options, Beginning balance (in shares) | 1.6 | 1.3
Shares, granted (in shares) |  | 0.8
Shares, vested (in shares) |  | (0.4)
Shares, forfeited (in shares) |  | (0.1)
Options, Ending balance (in shares) |  | 1.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |
Weighted-average grant-date fair value, Beginning balance | $ 19.00 | $ 14.46
Weighted-average exercise price, granted |  | 23.41
Weighted-average grant-date fair value, vested |  | 14.47
Weighted-average exercise price, forfeited |  | 15.68
Weighted-average grant-date fair value, Beginning balance |  | $ 19.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |
Total unrecognized compensation expense related to nonvested options |  | $ 12
Weighted-average years to be recognized over |  | 2 years 1 month 6 days
Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |
Weighted-average years to be recognized over | 1 year 330 days |

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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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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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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