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Stockholders' Equity and Accumulated Other Comprehensive Income (Loss) (Preferred Stock Issuances) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 120 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 15, 2029 | Sep. 15, 2025 | Mar. 31, 2024 | Sep. 15, 2024 | Dec. 31, 2023
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 1,750 |  |
Preferred stock, shares issued |  |  | 1,403,500 |  | 1,403,500
Preferred stock, shares outstanding |  |  | 1,403,500 |  |
Preferred Stock, Carrying Amount |  |  | $ 1,659 |  | $ 1,659
Series B Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 6.375% |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 500 |  |
Preferred stock, liquidation preference per share |  |  | $ 1,000 |  |
Preferred stock, shares issued |  |  | 500,000 |  |
Preferred stock, shares outstanding |  |  | 500,000 |  |
Preferred Stock, Carrying Amount |  |  | $ 433 |  | 433
Series C Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 5.70% |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 500 |  |
Preferred stock, liquidation preference per share |  |  | $ 1,000 |  |
Preferred stock, shares issued |  |  | 500,000 |  |
Preferred stock, shares outstanding |  |  | 500,000 |  |
Preferred Stock, Carrying Amount |  |  | $ 490 |  | 490
Series D Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 5.75% |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 350 |  |
Preferred stock, liquidation preference per share |  |  | $ 100,000 |  |
Preferred stock, shares issued |  |  | 3,500 |  |
Preferred stock, shares outstanding |  |  | 3,500 |  |
Preferred Stock, Carrying Amount |  |  | $ 346 |  | 346
Series E Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 4.45% |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 400 |  |
Preferred stock, liquidation preference per share |  |  | $ 1,000 |  |
Preferred stock, shares issued |  |  | 400,000 |  |
Preferred stock, shares outstanding |  |  | 400,000 |  |
Preferred Stock, Carrying Amount |  |  | $ 390 |  | $ 390
Scenario, Forecast | Series B Preferred Stock Dividend Scenario 1 [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 6.375% |
Scenario, Forecast | Series C Preferred Stock Dividend Scenario 1 Member [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 5.70% |  |  |  |
Scenario, Forecast | Series D Preferred Stock Dividend Scenario 1 Member [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.75% |  |  |
Plus 5-year Treasury rate [Member] | Scenario, Forecast | Series D Preferred Stock Dividend Scenario 2 Member [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Dividend Rate, Basis Spread on Variable Rate, Percentage |  | 5.426% |  |  |
Plus 3-month CME Term SOFR | Scenario, Forecast | Series B Preferred Stock Dividend Scenario 2 [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Dividend Rate, Basis Spread on Variable Rate, Percentage |  |  |  | 3.536% |
Plus 3-month CME Term SOFR | Scenario, Forecast | Series C Preferred Stock Dividend Scenario 2 Member [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Dividend Rate, Basis Spread on Variable Rate, Percentage | 3.148% |  |  |  |
Depositary Shares [Member] | Series B Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, liquidation preference per share |  |  | $ 25 |  |
Depositary Shares [Member] | Series C Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, liquidation preference per share |  |  | 25 |  |
Depositary Shares [Member] | Series D Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, liquidation preference per share |  |  | 1,000 |  |
Depositary Shares [Member] | Series E Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, liquidation preference per share |  |  | $ 25 |  |

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