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Common and Preferred Stock (Schedule of Share Repurchases) (Detail) - USD ($) $ / shares in Units, $ in Millions | 2 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 20, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Share Repurchases [Abstract] |  |  |  |
Number of shares repurchased | 3,000,000.0 | 11,100,000 | 5,800,000 | 43,000,000.0
Average price paid per share | $ 9.18 | $ 9.12 | $ 8.21 | $ 7.55
Remaining authorization as of December 31 | $ 74 | $ 101 | $ 202 | $ 250

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