Equity (Preferred Stock - Authorized, Issued and Outstanding) (Details) - $ / shares	Dec. 31, 2023	Nov. 01, 2023	Dec. 31, 2022	Nov. 01, 2022
Preferred stock authorized (shares)	20,000,000		20,000,000
Preferred stock outstanding (shares)	63,000		58,000
Common stock held in treasury at cost (shares)	145,087,054		142,298,689
Series B Preferred Stock
Preferred stock, liquidation preference per share (in USD per share)	$ 40
Preferred stock outstanding (shares)	1,000		1,000
Series O Preferred Stock
Preferred stock, liquidation preference per share (in USD per share)	$ 100,000
Preferred stock outstanding (shares)			10,000
Treasury stock, preferred (shares)		10,000
Series R Preferred Stock
Preferred stock, liquidation preference per share (in USD per share)	$ 100,000
Preferred stock outstanding (shares)	5,000		5,000
Series S Preferred Stock
Preferred stock, liquidation preference per share (in USD per share)	$ 100,000
Preferred stock outstanding (shares)	5,000		5,000
Series T Preferred Stock
Preferred stock, liquidation preference per share (in USD per share)	$ 100,000
Preferred stock outstanding (shares)	15,000		15,000
Series U Preferred Stock
Preferred stock, liquidation preference per share (in USD per share)	$ 100,000
Preferred stock outstanding (shares)	10,000		10,000
Series V Preferred Stock
Preferred stock, liquidation preference per share (in USD per share)	$ 100,000
Preferred stock outstanding (shares)	12,000		12,000
Series W Preferred Stock
Preferred stock, liquidation preference per share (in USD per share)	$ 100,000
Preferred stock outstanding (shares)	15,000
Depositary Shares
Common stock held in treasury at cost (shares)		1,000,000		60,000,000