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Stockholders' Equity (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 23, 2021 $ / shares | May 27, 2020 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) day $ / shares shares | Jun. 30, 2020 USD ($) | Dec. 31, 2020 $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |
Preferred Stock, Shares Authorized | shares |  |  | 50,000,000 | 50,000,000 |  | 50,000,000
Preferred Stock, Shares Issued | shares |  |  | 10,062,500 | 10,062,500 |  | 10,062,500
Net proceeds from issuance of preferred stock in connection with public offering | $ |  |  |  | $ 0 | $ 975 |
Payments of Dividends | $ |  |  |  | $ 28 | $ 0 |
Common Stock, Shares Authorized | shares |  |  | 2,000,000,000 | 2,000,000,000 |  | 2,000,000,000
Common Stock, Par or Stated Value Per Share | $ / shares |  |  | $ 0.01 | $ 0.01 |  | $ 0.01
5.50% MCPS, Series A [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred Stock, Shares Issued | shares |  | 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 | $ / shares |  | $ 100 | $ 100 | $ 100 |  |
Preferred Stock, Liquidation Preference, Value | $ |  |  | $ 1,006 | $ 1,006 |  |
Convertible Preferred Stock, Threshold Trading Days | day |  |  |  | 20 |  |
Preferred Stock, Dividends, Per Share, Cash Paid | $ / shares |  |  | $ 1.375 |  |  |
5.50% MCPS, Series A [Member] | Minimum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued For Each Converted Share |  |  |  | 2.3834 |  |
5.50% MCPS, Series A [Member] | Maximum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued For Each Converted Share |  |  |  | 2.9197 |  |
5.50% MCPS, Series A [Member] | Subsequent Event [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | $ / shares | $ 1.375 |  |  |  |  |

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