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Equity Narrative (Details)
$ / shares in Units, shares in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 911,000,000
Stock Issued During Period, Value, Dividend Reinvestment Plan $ 6,000,000
Stock Issued During Period, Shares, Dividend Reinvestment Plan | shares 0.9
Common Units Remaining Available to be Issued Under Distribution Reinvestment Plan | shares 20.0
Series E Preferred Units [Member]  
Preferred Stock, Dividend Rate, Percentage 7.60%
Shares Issued, Price Per Share | $ / shares $ 25
Preferred Units, Liquidation Spread, Percent 516.10%
Preferred Stock, Redemption Amount $ 25
Preferred Stock, Liquidation Preference, Value $ 25
Series A Preferred Units [Member]  
Preferred Stock, Dividend Rate, Percentage 6.25%
Shares Issued, Price Per Share | $ / shares $ 1,000
Preferred Units, Liquidation Spread, Percent 4.028%
Preferred Stock, Redemption Amount $ 1,000
Preferred Stock, Liquidation Preference, Value $ 1,000
Series C Preferred Units [Member]  
Preferred Stock, Dividend Rate, Percentage 7.375%
Shares Issued, Price Per Share | $ / shares $ 25
Preferred Units, Liquidation Spread, Percent 4.53%
Preferred Stock, Redemption Amount $ 25
Preferred Stock, Liquidation Preference, Value $ 25
Series B Preferred Units [Member]  
Preferred Stock, Dividend Rate, Percentage 6.625%
Shares Issued, Price Per Share | $ / shares $ 1,000
Preferred Units, Liquidation Spread, Percent 4.155%
Series D Preferred Units [Member]  
Preferred Stock, Dividend Rate, Percentage 7.625%
Shares Issued, Price Per Share | $ / shares $ 25
Preferred Units, Liquidation Spread, Percent 4.738%
Preferred Stock, Redemption Amount $ 25
Preferred Stock, Liquidation Preference, Value $ 25
Series F Preferred Units [Member]  
Preferred Stock, Dividend Rate, Percentage 6.75%
Shares Issued, Price Per Share | $ / shares $ 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 | $ / shares $ 1,000
Preferred Units, Liquidation Spread, Percent 5.306%
Preferred Stock, Redemption Amount $ 1,000
Preferred Stock, Liquidation Preference, Value $ 1,000