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Common and Preferred Stock (Schedule of Share Repurchases) (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Schedule of Share Repurchases [Abstract] |  |
Number of shares repurchased | 5,800,000 | 43,000,000
Average price paid per share | $ 8.21 | $ 7.55
Remaining authorization as of December 31 | $ 202 | $ 250

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Period Type: | instant

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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