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Stockholders' Equity - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Number of Shares
Beginning balance, outstanding (in shares)	405,000
Ending balance, outstanding (in shares)	405,000	405,000
Weighted Average Exercise Price
Beginning balance, outstanding (usd per share)	$ 64.79
Ending balance, outstanding (usd per share)	$ 64.79	$ 64.79
Stock options exercisable and expected to vest (in shares)	405,000
Exercisable (in shares)	405,000
Weighted Average Exercise Price, Stock options exercisable and expected to vest (usd per share)	$ 64.79
Weighted Average Exercise Price, Exercisable (usd per share)	$ 64.79
Outstanding, Aggregate Intrinsic Value	$ 60	$ 60
Exercisable, Aggregate Intrinsic Value	$ 60
Outstanding, Weighted Average Remaining Contractual term	6 years 4 months 24 days	6 years 4 months 24 days
Exercisable, Weighted Average Remaining Contractual term	6 years 4 months 24 days

X

- 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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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. 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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