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Stockholders' (Deficit) Equity (Narrative) (Details) - USD ($) shares in Millions | 1 Months Ended |
--- | --- | ---
Feb. 11, 2021 | Feb. 06, 2020 | Dec. 31, 2020
Treasury Stock Repurchase Programs [Line Items] |  |  |
Treasury Stock Shares Repurchased |  |  | 240.3
Additional share repurchase amount authorized | $ 747,000,000.0 | $ 743,000,000.0 |
Stock Repurchase Program, Authorized Amount | 1,000,000,000.0 | 1,000,000,000.0 |
Remaining common stock available for repurchase | $ 253,000,000.0 | $ 257,000,000.0 |
Payments for Repurchase of Common Stock |  |  | $ 10,980,000,000
Share Buyback Program [Member] |  |  |
Treasury Stock Repurchase Programs [Line Items] |  |  |
Remaining common stock available for repurchase |  |  | $ 335,600,000

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