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Stock-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Stock Options |  |
Grant date exercise price (in dollars per share) | $ 34 |
Stock options |  |
Stock Options |  |
Vesting period | 5 years |
Expiration period | 10 years |
Shares |  |
Outstanding at the beginning of the period (in shares) | 7,000,000 | 12,000,000
Granted (in shares) | 397,350 | 0
Exercised (in shares) | 1,000,000 | 2,000,000
Forfeited (in shares) | 0 | 0
Outstanding at the end of the period (in shares) | 6,000,000 | 10,000,000
Vested and expected to vest at the end of the period (in shares) | 6,000,000 | 10,000,000
Exercisable at the end of the period (in shares) | 4,000,000 | 8,000,000
Weighted average exercise price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 15 | $ 17
Granted (in dollars per share) | 34 | 26
Exercised (in dollars per share) | 15 | 21
Forfeited (in dollars per share) | 0 | 0
Outstanding at the end of the period (in dollars per share) | 16 | 17
Vested and expected to vest at the end of the period (in dollars per share) | 16 | 17
Exercisable at the end of the period (in dollars per share) | $ 13 | $ 16
Aggregate intrinsic value |  |
Exercised | $ 33 | $ 31
Vested and expected to vest at the end of the period | 130 | 137
Exercisable at the end of the period | $ 113 | $ 122
Weighted average remaining option term |  |
Outstanding at the end of the period | 4 years | 4 years
Vested and expected to vest at the end of the period | 4 years | 4 years
Exercisable at the end of the period | 3 years | 3 years
Additional disclosures |  |
Total unrecognized compensation expense | $ 9 | $ 8
Weighted average remaining vesting period | 3 years | 3 years

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- Definition Share Based Compensation, Arrangement by Share Based Payment Award Options, Outstanding Weighted Average Remaining Option Term [Rollforward] + References No definition available. + Details
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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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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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