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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended | 36 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Sep. 19, 2019 | Dec. 08, 2017 | Dec. 07, 2016 | Sep. 10, 2015
Stock repurchase program, period in force |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Net income (1) | $ 161 | $ 187 | $ 179 | $ 42 | $ 170 | $ 50 | $ (121) | $ 90 | $ 569 | $ 189 | $ 1,140 |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 800 | $ 750 | $ 500 | $ 250
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  | $ 535 | $ 375 | $ 380 |  |  |  |  |
Common Stock reserved for issuance | 18,300,000 |  |  |  |  |  |  |  | 18,300,000 |  |  | 18,300,000 |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  | 28,100,000 | 19,100,000 | 18,700,000 |  |  |  |  |
Treasury Stock, Shares | 144,600,000 |  |  |  | 116,000,000 |  |  |  | 144,600,000 | 116,000,000 |  | 144,600,000 |  |  |  |
Accelerated Share Repurchases, Final Price Paid Per Share |  |  |  |  |  |  |  |  | $ 19.02 | $ 19.60 | $ 20.36 |  |  |  |  |

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