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Equity Stock Repurchases - USD ($) shares in Millions, $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Feb. 22, 2019 | Feb. 26, 2018 | Feb. 23, 2017 | Feb. 24, 2016
Stock Repurchases [Line Items] |  |  |  |  |
Shares Repurchased and Retired During Period, Shares | 1.2 |  |  |  |
Shares Repurchased and Retired During Period, Value | $ 20 |  |  |  |
Weighted Average Market Price of Shares Repurchased and Retired During Period | $ 17.21 |  |  |  |
Maximum | 2016 Stock Repurchase Plan |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |
Shares Authorized under Stock Repurchase Program, |  |  |  |  | $ 275
Maximum | 2017 Stock Repurchase Plan |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |
Shares Authorized under Stock Repurchase Program, |  |  |  | $ 300 |
Maximum | 2018 Stock Repurchase Plan |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |
Shares Authorized under Stock Repurchase Program, |  |  | $ 350 |  |
Maximum | 2019 Stock Repurchase Plan |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |
Shares Authorized under Stock Repurchase Program, |  | $ 175 |  |  |

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