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Stockholders' Equity - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016
Shares
Beginning balance, outstanding (in shares)	405,000
Granted (in shares)	0	0
Exercised (in shares)	0
Ending balance, outstanding (in shares)	405,000
Weighted Average Exercise Price
Beginning balance, outstanding (usd per share)	$ 64.79
Granted (usd per share)	0.00
Exercised (usd per share)	0.00
Ending balance, outstanding (usd per share)	$ 64.79
Outstanding, Aggregate Intrinsic Value	$ 21
Outstanding, Weighted Average Remaining Contractual term	8 years 6 months
Stock options exercisable and expected to vest (in shares)	405,000
Stock options exercisable and expected to vest (usd per share)	$ 64.79
Exercisable (in shares)	155,000
Exercisable (usd per share)	$ 60.69
Exercisable, Aggregate Intrinsic Value	$ 9
Exercisable, Weighted Average Remaining Contractual term	8 years

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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.

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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.

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Gross number of share options (or share units) granted during the period.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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