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Equity Narrative (Details) - USD ($)
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 911,000,000  
Stock Issued During Period, Value, Dividend Reinvestment Plan $ 24,000,000 $ 72,000,000
Preferred Units, Issued 900,000  
Stock Issued During Period, Shares, Dividend Reinvestment Plan 2,700,000  
Common Units Remaining Available to be Issued Under Distribution Reinvestment Plan 18,000,000  
Series F Preferred Units [Member]    
Preferred Stock, Dividend Rate, Percentage 6.75%  
Shares Issued, Price Per Share $ 1,000  
Preferred Units, Liquidation Spread, Percent 5.134%  
Preferred Stock, Redemption Amount $ 1,000  
Preferred Stock, Liquidation Preference, Value $ 1,000  
Series G Preferred Units [Member]    
Preferred Stock, Dividend Rate, Percentage 7.125%  
Shares Issued, Price Per Share $ 1,000  
Preferred Units, Liquidation Spread, Percent 5.306%  
Preferred Stock, Redemption Amount $ 1,000  
Preferred Stock, Liquidation Preference, Value $ 1,000  
Series H Preferred Units    
Preferred Stock, Dividend Rate, Percentage 6.50%  
Preferred Units, Liquidation Spread, Percent 5.694%  
Preferred Stock, Redemption Amount $ 1,000  
Preferred Stock, Liquidation Preference, Value $ 1,000  
Series F Preferred Units [Member]    
Preferred Stock, Shares Outstanding 500,000  
Series G Preferred Units [Member]    
Preferred Stock, Shares Outstanding 1,100,000  
Series E Preferred Units [Member]    
Preferred Stock, Dividend Rate, Percentage 7.60%  
Shares Issued, Price Per Share $ 25  
Preferred Units, Liquidation Spread, Percent 516.10%  
Preferred Stock, Redemption Amount $ 25  
Preferred Stock, Liquidation Preference, Value $ 25  
Preferred Stock, Shares Outstanding 32,000,000  
Series D Preferred Units [Member]    
Preferred Stock, Dividend Rate, Percentage 7.625%  
Shares Issued, Price Per Share $ 25  
Preferred Units, Liquidation Spread, Percent 4.738%  
Preferred Stock, Redemption Amount $ 25  
Preferred Stock, Liquidation Preference, Value $ 25  
Preferred Stock, Shares Outstanding 17,800,000  
Series C Preferred Units [Member]    
Preferred Stock, Dividend Rate, Percentage 7.375%  
Shares Issued, Price Per Share $ 25  
Preferred Units, Liquidation Spread, Percent 4.53%  
Preferred Stock, Redemption Amount $ 25  
Preferred Stock, Liquidation Preference, Value $ 25  
Preferred Stock, Shares Outstanding 18,000,000  
Series B Preferred Units [Member]    
Preferred Stock, Dividend Rate, Percentage 6.625%  
Shares Issued, Price Per Share $ 1,000  
Preferred Units, Liquidation Spread, Percent 4.155%  
Preferred Stock, Shares Outstanding 550,000  
Series A Preferred Units [Member]    
Preferred Stock, Dividend Rate, Percentage 6.25%  
Shares Issued, Price Per Share $ 1,000  
Preferred Units, Liquidation Spread, Percent 4.028%  
Preferred Stock, Redemption Amount $ 1,000  
Preferred Stock, Liquidation Preference, Value $ 1,000  
Preferred Stock, Shares Outstanding 950,000  
Series H Preferred Units    
Preferred Stock, Shares Outstanding 900,000