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Net Income Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 15, 2021 | Sep. 17, 2018 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Earnings Per Share [Abstract] |  |  |  |  |  |  |
Dividends declared per share, in dollars per share |  |  | $ 0.79 | $ 0.77 | $ 2.33 | $ 2.27 |
Tangible equity units issued |  | 16,500,000 |  |  |  |  |
Tangible equity units proceeds |  | $ 800 |  |  |  |  |
Shares issued during period | 5,460,031 |  |  |  |  |  |
Price for basic share (usd per share) |  |  |  |  | 0.330911 | 0.313400 |
Tangible Equity Units, Price for Shares Diluted |  |  |  |  | 0.330911 | 0.383900 |
Difference between basic and diluted net income per share, in dollars per share |  |  | 0.01 | $ 0.01 | 0.01 | $ 0.03 |
Common stock, par value, in dollars per share |  |  | $ 0.125 |  | $ 0.125 |  | $ 0.125

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