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Earnings (Loss) Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Earnings |  |  |  |
Net income | $ 468 | $ 372 | $ 741 | $ 1,002
Less: Preferred stock dividends | 5 | 0 | 10 | 5
Net income available to common stockholders | $ 463 | $ 372 | $ 731 | $ 997
Shares |  |  |  |
Weighted average common shares outstanding, basic | 358.1 | 361.4 | 358.3 | 360.7
Dilutive effect of warrants [1] | 0.0 | 0.5 | 0.0 | 0.9
Dilutive effect of stock-based awards under compensation plans | 1.2 | 3.2 | 1.9 | 3.3
Weighted average common shares outstanding and dilutive potential common shares | 359.3 | 365.1 | 360.2 | 364.9
Earnings Per Share, Basic [Abstract] |  |  |  |
Net income available to common stockholders | $ 1.29 | $ 1.03 | $ 2.04 | $ 2.76
Earnings Per Share, Diluted [Abstract] |  |  |  |
Net income available to common stockholders | $ 1.29 | $ 1.02 | $ 2.03 | $ 2.73

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