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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2021 | Dec. 01, 2020 | Sep. 01, 2020 | May 27, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 14, 2020 | Jan. 25, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  | 50,000,000 | 50,000,000 |  |  |
Preferred Stock, Shares Issued |  |  |  |  | 10,062,500 |  |  |  |
Net proceeds from issuance of preferred stock in connection with public offering |  |  |  |  | $ 975 | $ 0 | $ 0 |  |
Payments of Dividends |  |  |  |  | $ 28 | $ 0 | 0 |  |
Common Stock, Shares Authorized |  |  |  |  | 2,000,000,000 | 2,000,000,000 |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.01 | $ 0.01 |  |  |
Net proceeds from issuance of common stock in connection with public offering |  |  |  |  | $ 975 | $ 0 | 0 |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 1,000 | $ 1,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  | 15,700,000 |  |  |  |
Payments for repurchase of common stock |  |  |  |  | $ 535 | $ 0 | $ 0 |  |
Treasury Stock, Shares |  |  |  |  | 263,289,848 | 247,566,270 |  |  |
5.50% MCPS, Series A [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  | 10,062,500 |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 5.50% |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  | $ 100 | $ 100 |  |  |  |
Net proceeds from issuance of preferred stock in connection with public offering |  |  |  | $ 975 |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  |  |  | $ 1,006 |  |  |  |
Preferred Stock, Dividends, Per Share, Cash Paid |  | $ 1.3750 | $ 1.4361 |  |  |  |  |  |
Payments of Dividends |  | $ 14 | $ 14 |  |  |  |  |  |
5.50% MCPS, Series A [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Terms of Conversion |  |  |  |  | 2.3834 |  |  |  |
5.50% MCPS, Series A [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Terms of Conversion |  |  |  |  | 2.9197 |  |  |  |
5.50% MCPS, Series A [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividends, Per Share, Cash Paid | $ 1.375 |  |  |  |  |  |  |  |
Payments of Dividends | $ 14 |  |  |  |  |  |  |  |
Dividends Payable | $ 5 |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 29,382,500 |  |  |  |  |
Shares Issued, Price Per Share |  |  |  | $ 34.25 |  |  |  |  |
Net proceeds from issuance of common stock in connection with public offering |  |  |  | $ 975 |  |  |  |  |

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