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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Mar. 31, 2021
Dec. 31, 2020
Equity (Note E)    
Preferred stock, shares, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares, issued (in shares) 20,000 20,000
Common stock, shares, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares, authorized (in shares) 1,200,000,000 1,200,000,000
Common stock, shares, issued (in shares) 474,916,234 474,916,234
Common stock, shares, outstanding (in shares) 445,534,180 444,872,383
Treasury stock, shares, (in shares) 29,382,054 30,043,851