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Stockholders' Equity (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2021 | Dec. 31, 2018
Purchases of common stock, shares | 400,000 | 500,000 | 400,000 |  |
Purchases of common stock, value | $ 70 | $ 76 | $ 44 |  |
At the Market Stock Offering Program, aggregate value of common stock | $ 750 |  |  |  | $ 750
Availability Under ATM |  |  |  | $ 750 |
Conversion factor, 6.785% Mandatory Convertible Preferred Stock |  | 8.8043 |  |  |
Common Stock [Member] | Conversion of 6.875% Mandatory Convertible Preferred Stock [Domain] |  |  |  |  |
Conversion of Stock, Shares Issued |  | 14,000,000 |  |  |
6.875% Mandatory Convertible Preferred Stock [Member] | Conversion of 6.875% Mandatory Convertible Preferred Stock [Domain] |  |  |  |  |
Conversion of Stock, Shares Converted |  | 2,000,000 |  |  |

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