Consolidated Balance Sheets (Parentheticals) - USD ($) $ / shares in Thousands, $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Accounts receivable, allowance for credit losses	$ 15	$ 17
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)	111,166,022	107,179,827
Common stock, shares outstanding (in shares)	90,768,247	87,227,481
Treasury stock, shares (in shares)	20,397,775	19,952,346
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)	11,237,386	10,413,993
Common stock, shares outstanding (in shares)	8,814,187	8,162,266
Treasury stock, shares (in shares)	2,423,199	2,251,727