Stockholders' Equity (Summary of Share Repurchase Activity) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Stockholders' Equity [Abstract]
Number of shares acquired on the open market		1,758,537
Average price per share		$ 14.24
Total cost of acquired shares		$ 25

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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