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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 27, 2020 | Sep. 01, 2020 | May 27, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
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 |
Payments of Dividends |  |  |  |  | $ 14 | 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
Proceeds from Issuance of Common Stock |  |  |  |  | $ 975 | $ 0 |
5.50% MCPS, Series A [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  | 10,062,500 |  |  |  |
Net proceeds from issuance of preferred stock in connection with public offering |  |  | $ 975 |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 5.50% |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  | $ 100 |  | $ 100 |  |
Preferred Stock, Liquidation Preference, Value |  |  |  |  | $ 1,006 |  |
Preferred Stock, Dividends, Per Share, Cash Paid |  | $ 1.4361 |  |  |  |  |
Payments of Dividends |  | $ 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, Declared | $ 1.375 |  |  |  |  |  |
Dividends, Preferred Stock, Cash | $ 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 |  |  |  |
Proceeds from Issuance of Common Stock |  |  | $ 975 |  |  |  |

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