CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands, shares in Millions	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Trading investments, cost	$ 43,412	$ 47,554
Available-forsale investments at fair value, cost	2,563,984	2,554,332
Allowance for credit losses	$ 1,339,772	$ 1,357,075
Preferred stock, par or stated value (in dollars per share)	$ 0.20	$ 0.20
Preferred stock, shares authorized (in shares)	20.0	20.0
Preferred stock, shares issued (in shares)	2.5	2.5
Preferred stock liquidation preference (in dollars per share)	$ 100	$ 100
Common stock, par value (in dollars per share)	$ 0.20	$ 0.20
Common stock, shares authorized (in shares)	1,125.0	1,125.0
Common stock, shares issued (in shares)	438.2	435.1
Tax benefit on accumulated other comprehensive loss	$ 24,176	$ 30,160
Common stock held in treasury (in shares)	217.9	194.4