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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
	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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Aggregate dividends paid during the period for each share of common stock outstanding.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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