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Stockholders' Equity (Details) $ / shares in Units, shares in Millions |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 04, 2020 $ / shares shares | Dec. 08, 2017 USD ($) | Mar. 31, 2020 $ / shares shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 agreement $ / shares | Dec. 31, 2021 shares | Sep. 19, 2019 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program, period in force |  | 2 years |  |  |  |  |  |
Stock repurchase program, authorized amount | $ |  | $ 750,000,000 |  |  |  |  |  | $ 800,000,000
ASR agreements | agreement |  |  |  |  |  | 4 |  |
Payments for repurchase of common stock | $ |  |  |  | $ 160,000,000 | $ 535,000,000 |  |  |
Treasury stock, shares, acquired (in shares) |  |  | 13.0 | 13.0 | 28.1 |  |  |
Accelerated share repurchases, final price paid (in dollars per share) | $ / shares |  |  |  |  |  | $ 19.02 |  |
Sale of stock, price (in dollars per share) | $ / shares |  |  | $ 12.27 |  |  |  |  |
Shares Issued, Price (in dollars per share) | $ / shares | $ 14.40 |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  | 21.8 |
Treasury stock, shares (in shares) |  |  |  | 158.0 |  |  | 158.5 |
Common Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues (in shares) | 42.0 |  |  |  |  |  |  |

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