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Stockholders' Equity (Details) $ / shares in Units, shares in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 08, 2017 USD ($) | Mar. 31, 2020 $ / shares shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) agreement $ / shares shares | Dec. 31, 2018 USD ($) agreement $ / shares shares | Dec. 04, 2020 $ / shares | Sep. 19, 2019 USD ($)
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |
Stock repurchase program, period in force | 2 years |  |  |  |  |  |
Stock repurchase program, authorized amount | $ | $ 750,000,000 |  |  |  |  |  | $ 800,000,000
ASR agreements | agreement |  |  |  | 4 | 3 |  |
Payments for repurchase of common stock | $ |  |  | $ 160,000,000 | $ 535,000,000 | $ 375,000,000 |  |
Treasury stock, shares, acquired (in shares) | shares |  | 13.0 |  | 28.1 | 19.1 |  |
Accelerated share repurchases, final price paid (in dollars per share) | $ / shares |  |  |  | $ 19.02 | $ 19.60 |  |
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) | shares |  |  | 26.5 |  |  |  |
Treasury stock, shares (in shares) | shares |  |  | 158.0 | 145.0 |  |  |

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