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Stock Based Awards and Other Equity Instruments - Summary of Stock Option (Details) - Stock Options $ / shares in Units, shares in Thousands, $ in Millions | 6 Months Ended
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Jun. 30, 2016 USD ($) $ / shares shares
Options Outstanding |  |
Options Outstanding, Beginning balance | shares | 5,720 |
Options Outstanding, Granted | shares | 1,033 |
Options Outstanding, Exercised | shares | (554) | [1]
Options Outstanding, Cancelled or expired | shares | (165) |
Options Outstanding, Ending balance | shares | 6,034 |
Options Outstanding, Exercisable | shares | 2,874 |
Options Outstanding, Vested and expected to vest | shares | 5,647 |
Weighted Average Exercise Price per share |  |
Options Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares | $ 53.71 |
Options Granted, Weighted Average Exercise Price | $ / shares | 63.44 |
Options Exercised, Weighted Average Exercise Price | $ / shares | 29.34 | [1]
Options Cancelled or expired, Weighted Average Exercise Price | $ / shares | 69.53 |
Options Outstanding, Weighted Average Exercise Price, Ending balance | $ / shares | 57.18 |
Options Exercisable, Weighted Average Exercise Price | $ / shares | 42.45 |
Options Vested and expected to vest, Weighted Average Exercise Price | $ / shares | $ 56.59 |
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value |  |
Options Outstanding, Weighted Average Remaining Contractual Life | 5 years 10 months 24 days |
Options Exercisable, Weighted Average Remaining Contractual Life | 4 years 7 months 6 days |
Options Vested and expected to vest, Weighted Average Remaining Contractual Life | 5 years 8 months 12 days |
Options Outstanding, Aggregate Intrinsic Value | $ | $ 78 |
Options Exercisable, Aggregate Intrinsic Value | $ | 71 |
Options Vested and expected to vest, Aggregate Intrinsic Value | $ | $ 77 |
[1] | Inclusive of 246,826 options which were not converted into shares due to net share settlement in order to cover the aggregate exercise price and the minimum amount of required employee withholding taxes. Potential shares that had been convertible under stock options that were withheld under net share settlement remain in the authorized but unissued pool under the 2011 Plan and can be reissued by the Company. Total payments for the employees’ tax obligations to the taxing authorities due to net share settlements are reflected as a financing activity within the unaudited condensed consolidated statements of cash flows.

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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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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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