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Preferred Stock Issuances (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 120 Months Ended
Aug. 15, 2029
Sep. 15, 2025
Jun. 30, 2021
Sep. 15, 2024
Dec. 31, 2020
Class of Stock [Line Items]          
Preferred Stock, Liquidation Preference, Value     $ 1,750    
Preferred stock     $ 1,659   $ 1,656
Series A Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred Stock, Dividend Rate, Percentage [1],[2]     6.375%    
Preferred Stock, Liquidation Preference, Value     $ 0    
Preferred Stock, Liquidation Preference Per Share     $ 1,000    
Preferred stock     $ 0   387
Series B Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred Stock, Dividend Rate, Percentage [1],[3]     6.375%    
Preferred Stock, Liquidation Preference, Value     $ 500    
Preferred Stock, Liquidation Preference Per Share     $ 1,000    
Preferred stock     $ 433   433
Series C Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred Stock, Dividend Rate, Percentage [1],[4]     5.70%    
Preferred Stock, Liquidation Preference, Value     $ 500    
Preferred Stock, Liquidation Preference Per Share     $ 1,000    
Preferred stock     $ 490   490
Series D Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred Stock, Dividend Rate, Percentage [1],[5]     5.75%    
Preferred Stock, Liquidation Preference, Value     $ 350    
Preferred Stock, Liquidation Preference Per Share     $ 100,000    
Preferred stock     $ 346   346
Series E Preferred Stock          
Class of Stock [Line Items]          
Preferred Stock, Dividend Rate, Percentage [1]     4.45%    
Preferred Stock, Liquidation Preference, Value     $ 400    
Preferred Stock, Liquidation Preference Per Share     $ 1,000    
Preferred stock     $ 390   $ 0
Forecast [Member] | Series B Preferred Stock Dividend Scenario 1 [Member]          
Class of Stock [Line Items]          
Preferred Stock, Dividend Rate, Percentage       6.375%  
Forecast [Member] | Series C Preferred Stock Dividend Scenario 1 [Member] [Member]          
Class of Stock [Line Items]          
Preferred Stock, Dividend Rate, Percentage 5.70%        
Plus 3-Month LIBOR [Member] | Forecast [Member] | 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 LIBOR [Member] | Forecast [Member] | 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%        
Plus 5-year Treasury rate [Member] | Forecast [Member] | Series D Preferred Stock Dividend Scenario 1 [Member]          
Class of Stock [Line Items]          
Preferred Stock, Dividend Rate, Percentage   5.75%      
Plus 5-year Treasury rate [Member] | Forecast [Member] | Series D Preferred Stock Dividend Scenario 2 [Member]          
Class of Stock [Line Items]          
Preferred Stock, Dividend Rate, Basis Spread on Variable Rate, Percentage   5.426%      
Depositary Shares [Member] | Series A Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred Stock, Liquidation Preference Per Share     $ 25    
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 [Member]          
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    
[1] Dividends on all series of preferred stock, if declared, accrue and are payable quarterly in arrears.
[2] The shares were fully redeemed on June 15, 2021.
[3] Dividends, if declared, will be paid quarterly at an annual rate equal to (i) for each period beginning prior to September 15, 2024, 6.375%, and (ii) for each period beginning on or after September 15, 2024, three-month LIBOR plus 3.536%.
[4] Dividends, if declared, will be paid quarterly at an annual rate equal to (i) for each period beginning prior to August 15, 2029, 5.700%, and (ii) for each period beginning on or after August 15, 2029, three-month LIBOR plus 3.148%.
[5] Dividends, if declared, will be paid quarterly at an annual rate equal to (i) for each period beginning prior to September 15, 2025, 5.750%, and (ii) for each period beginning on or after September 15, 2025, the five-year treasury rate as of the most recent reset dividend determination date plus 5.426%.