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Consolidated Statement of Changes in Equity (Parenthetical)
$ in Millions
 12 Months Ended
Aug. 19, 2022
$ / shares
shares
Sep. 13, 2021
$ / shares
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Nov. 01, 2022
shares
Sep. 01, 2020
shares
Par value less than $.5 million at each date | $     $ 0.5 $ 0.5 $ 0.5    
Common stock held in treasury at cost (shares)     142,000,000 123,000,000      
Common stock              
Common stock activity, shares     500,000 500,000 500,000    
Series Q Preferred Stock              
Treasury stock, preferred (shares)             4,800
Depositary Shares              
Common stock held in treasury at cost (shares)           60,000,000 19,200,000
Series T Preferred Stock              
Common stock activity, shares   1,500,000          
Depositary shares, conversion ratio   0.01          
Preferred stock, dividend rate, percentage   3.40%          
Preferred stock, par value (in dollars per share) | $ / shares   $ 1          
Series V Preferred Stock              
Common stock activity, shares 1,250,000            
Depositary shares, conversion ratio 0.01            
Preferred stock, dividend rate, percentage 6.20%            
Preferred stock, par value (in dollars per share) | $ / shares $ 1            
Series P Preferred Stock              
Treasury stock, preferred (shares)           15,000  
Depositary shares, conversion ratio           0.01