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Net Income Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Sep. 17, 2018 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Earnings Per Share [Abstract] |  |  |  |
Dividends declared per share, in dollars per share |  | $ 0.77 | $ 0.75 |
Tangible equity units issued | 16,500,000 |  |  |
Tangible equity units proceeds | $ 800 |  |  |
Price for basic share (usd per share) |  | 0.3134 | 0.3134 |
Tangible Equity Units, Price for Shares Diluted | $ 0.3839 | 0.3665 | 0.3839 |
Difference between basic and diluted net income per share, in dollars per share |  |  | $ 0.01 |
Common stock, par value, in dollars per share |  | $ 0.125 |  | $ 0.125

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