Fair Value (Narrative) (Details) - USD ($) $ in Billions	3 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Carrying value of FHLB and FRB stock		$ 2.1	$ 2.7
Distributions received over the life of the partnerships from liquidation of the underlying investments by the investee, period		12 years
Sensitivity analysis of fair value, inputs change for fair value		0.10%
Shares exchange program, percentage of shares monetized	50.00%