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Stock-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Stock Options |  |
Grant date intrinsic value (in dollars per share) | $ 48 |
Shares |  |
Granted (in shares) | 420,840 |
Forfeited (in shares) | 16,240 |
Stock options |  |
Shares |  |
Outstanding at the beginning of the period (in shares) | 3,000,000 | 4,000,000
Granted (in shares) | 1,000,000 | 1,000,000
Exercised (in shares) | 1,000,000 | 1,000,000
Forfeited (in shares) | 0 | 0
Outstanding at the end of the period (in shares) | 3,000,000 | 4,000,000
Vested and expected to vest at the end of the period (in shares) | 3,000,000 | 4,000,000
Exercisable at the end of the period (in shares) | 1,000,000 | 2,000,000
Weighted average exercise price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 27 | $ 21
Granted (in dollars per share) | 48 | 36
Exercised (in dollars per share) | 17 | 11
Forfeited (in dollars per share) | 42 | 36
Outstanding at the end of the period (in dollars per share) | 33 | 25
Vested and expected to vest at the end of the period (in dollars per share) | 33 | 25
Exercisable at the end of the period (in dollars per share) | $ 27 | $ 20
Aggregate intrinsic value |  |
Exercised | $ 23 | $ 17
Vested and expected to vest at the end of the period | 46 | 52
Exercisable at the end of the period | $ 34 | $ 45
Weighted average remaining option term |  |
Outstanding at the end of the period | 7 years | 6 years
Vested and expected to vest at the end of the period | 7 years | 6 years
Exercisable at the end of the period | 5 years | 4 years
Additional disclosures |  |
Total unrecognized compensation expense | $ 8 | $ 11
Weighted average remaining vesting period | 3 years | 3 years
Five Year Vesting | Stock options |  |
Stock Options |  |
Vesting period | 5 years |
Three Year Vesting | Stock options |  |
Stock Options |  |
Vesting period | 3 years |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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