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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ / shares in Thousands, $ in Millions
Dec. 31, 2023
Dec. 31, 2022
Accounts receivable, allowance for credit losses $ 17 $ 16
Series A Perpetual Preferred Stock, par value (in dollars per share) $ 0 $ 0
Series A Perpetual Preferred Stock, shares authorized (in shares) 1,500,000 1,500,000
Series A Perpetual Preferred Stock, shares issued (in shares) 650,000 650,000
Series A Perpetual Preferred Stock, shares outstanding (in shares) 650,000 650,000
Series A Perpetual Preferred Stock, liquidation value $ 650 $ 650
Common stock, shares authorized (in shares) 200,000,000  
Common Stock (No Par Value) [Member]    
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 107,179,827 105,104,057
Common stock, shares outstanding (in shares) 87,227,481 85,467,271
Treasury Stock, Common, Shares 19,952,346 19,636,786
Class A Common Stock (No Par Value) [Member]    
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 25,000,000 25,000,000
Common stock, shares issued (in shares) 10,413,993 9,675,139
Common stock, shares outstanding (in shares) 8,162,266 7,544,415
Treasury Stock, Common, Shares 2,251,727 2,130,724