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Stockholders' Equity - Schedule of Preferred Stock (Details) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($)
Class of Stock [Line Items] |  |
Preferred Stock, Including Additional Paid in Capital, Net of Discount | $ 4,853 | $ 4,360
Depository Share, Percent Interest in Preferred Stock | 0.025 |
Series B Preferred Stock |  |
Class of Stock [Line Items] |  |
Per Annum Dividend Rate | 6.00% |
Liquidation Preference per Share | $ / shares | $ 1,000 |
Total Shares Outstanding as of December 31, 2019 | shares | 875,000 |
Preferred Stock, Including Additional Paid in Capital, Net of Discount | $ 853 | 853
Series C Preferred Stock |  |
Class of Stock [Line Items] |  |
Per Annum Dividend Rate | 6.25% |
Liquidation Preference per Share | $ / shares | $ 1,000 |
Total Shares Outstanding as of December 31, 2019 | shares | 0 |
Preferred Stock, Including Additional Paid in Capital, Net of Discount | $ 0 | 484
Series D Preferred Stock |  |
Class of Stock [Line Items] |  |
Per Annum Dividend Rate | 6.70% |
Liquidation Preference per Share | $ / shares | $ 1,000 |
Total Shares Outstanding as of December 31, 2019 | shares | 0 |
Preferred Stock, Including Additional Paid in Capital, Net of Discount | $ 0 | 485
Series E Preferred Stock |  |
Class of Stock [Line Items] |  |
Per Annum Dividend Rate | 5.55% |
Liquidation Preference per Share | $ / shares | $ 1,000 |
Total Shares Outstanding as of December 31, 2019 | shares | 1,000,000 |
Preferred Stock, Including Additional Paid in Capital, Net of Discount | $ 988 | 988
Preferred Stock, Dividend Payment Rate, Variable | Libor + 380 bps |
Preferred Stock Dividend Rate, Variable | 3.80% |
Series F Preferred Stock |  |
Class of Stock [Line Items] |  |
Per Annum Dividend Rate | 6.20% |
Liquidation Preference per Share | $ / shares | $ 1,000 |
Total Shares Outstanding as of December 31, 2019 | shares | 500,000 |
Preferred Stock, Including Additional Paid in Capital, Net of Discount | $ 484 | 484
Series G Preferred Stock |  |
Class of Stock [Line Items] |  |
Per Annum Dividend Rate | 5.20% |
Liquidation Preference per Share | $ / shares | $ 1,000 |
Total Shares Outstanding as of December 31, 2019 | shares | 600,000 |
Preferred Stock, Including Additional Paid in Capital, Net of Discount | $ 583 | 583
Series H Preferred Stock |  |
Class of Stock [Line Items] |  |
Per Annum Dividend Rate | 6.00% |
Liquidation Preference per Share | $ / shares | $ 1,000 |
Total Shares Outstanding as of December 31, 2019 | shares | 500,000 |
Preferred Stock, Including Additional Paid in Capital, Net of Discount | $ 483 | 483
Series I Preferred Stock |  |
Class of Stock [Line Items] |  |
Per Annum Dividend Rate | 5.00% |
Liquidation Preference per Share | $ / shares | $ 1,000 |
Total Shares Outstanding as of December 31, 2019 | shares | 1,500,000 |
Preferred Stock, Including Additional Paid in Capital, Net of Discount | $ 1,462 | $ 0

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