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Stockholders' Equity - Common Share Repurchases, Issuances and Dividends Paid (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Average purchase price per share | $ 17.02 |  | $ 15.05 | $ 14.61
Remaining common stock repurchase authority | $ 300 | $ 665 | $ 300 | $ 665
Shares repurchased related to employee stock-based compensation plans | 600,000 |  | 2,800,000 | 900,000
Average purchase price per share | $ 17.28 |  | $ 12.99 | $ 13.66
Common shares issued | 600,000 | 100,000 | 4,300,000 | 2,400,000
Dividends paid | $ 27 | $ 31 | $ 56 | $ 62
Dividends per common share | $ 0.16 | $ 0.16 | $ 0.32 | $ 0.32
Common Stock Shares Outstanding [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common stock repurchased, shares | 11,800,000 |  | 19,900,000 | 23,000,000.0
Common stock repurchased, value | $ 200 |  | $ 300 | $ 335
Shares repurchased related to employee stock-based compensation plans | 559,580 | 4,125 | 2,795,238 | 904,402
Common shares issued | 641,126 | 90,689 | 4,265,712 | 2,362,243

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