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Description of Business and Summary of Significant Accounting Policies, Earnings Per Share (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Earnings Per Share [Abstract] |  |
Percentage of earnings distributed as dividends in earnings per share calculation | 100.00% | 100.00%

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- Definition The percentage of earnings (losses) assumed to be distributed as dividends in the calculation of income (loss) per share for each class of common stock using the two-class method. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration