Fair Value (Narrative) (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Carrying value of FHLB and FRB stock	$ 2.7	$ 2.5
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%