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Consolidated Statements of Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares issued pursuant to dividend reinvestment plan (in shares) 228,498,000 430,462,000 572,928,000
Shares due to exercise of employee stock options and issuance of directors' deferred stock (in shares) 16,887,000 61,571,000 43,150,000
Issuance of partnership units pursuant to dividend reinvestment plan (in shares) 51,579,000 60,936,000 107,433,000
Issuance of partnership units (in shares) 51,579,000 60,936,000 284,113,000
Series D Cumulative Redeemable Preferred Stock      
Issuance of Series D Cumulative preferred stock (in shares)     30,000,000
Series C Cumulative Preferred Stock      
Redemption of Series C Cumulative preferred stock (in shares)   42,000,000 30,000,000
Series E Cumulative Redeemable Preferred Stock      
Issuance of Series D Cumulative preferred stock (in shares)   44,000,000  
Dividend declared      
Distributions payable common stock and partnership units (in usd per share) $ 0.53 $ 0.53 $ 0.53
Dividend declared | Series D Cumulative Redeemable Preferred Stock      
Distributions payable on preferred stock (in usd per share) 38.28 38.28 38.28
Dividend declared | Series C Cumulative Preferred Stock      
Distributions payable on preferred stock (in usd per share)     $ 42.97
Dividend declared | Series E Cumulative Redeemable Preferred Stock      
Distributions payable on preferred stock (in usd per share) $ 37.50 $ 37.50