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Capital Stock, Dividends and Common Stock Repurchase Program - Repurchases (Detail) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
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Dec. 31, 2020 $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Capital Stock, Dividends and Common Stock Repurchase Program |  |  |  |
Common stock, shares authorized | shares | 1,500,000,000 | 1,500,000,000 | 1,500,000,000 |
Common stock, par value | $ / shares | $ 0.01 | $ 0.01 | $ 0.01 |
Common stock, shares issued | shares | 630,282,461 | 630,282,461 | 630,282,461 |
Number of common shares outstanding | shares | 422,800,000 | 422,800,000 | 424,300,000 | 424,000,000.0
Preferred stock shares authorized | shares | 10,000,000 | 10,000,000 |  |
Preferred stock par value per share | $ / shares | $ 0.01 | $ 0.01 |  |
Preferred stock shares outstanding | shares | 0 | 0 |  |
Cash dividends | $ |  | $ 927 | $ 876 | $ 802
Cash dividends declared and paid per common share | $ / shares |  | $ 2.18 | $ 2.05 | $ 1.86
Quarterly common stock dividend per share | $ / shares | 0.545 |  |  |
Expected quarterly common stock dividend per share | $ / shares | $ 0.575 |  |  |

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