Stock-based Compensation Plans - Stock Options, Narrative (Details) - $ / shares |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||
| Options outstanding (in shares) | 0 | 16,600,000 |
| Options outstanding (in dollars per share) | $ 43.44 | |
| Options exercised (in shares) | 2,100,000 | |
| Options forfeited (in shares) | 14,500,000 | |
| Options exercised (in dollars per share) | $ 30.71 | |
| Options forfeited (in dollars per share) | $ 45.29 |
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- References No definition available.
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
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| X | ||||||||||
- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
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| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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