Subsequent Events (Details) - USD ($) $ in Billions		3 Months Ended		6 Months Ended
	Jul. 28, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2022
Subsequent Event [Line Items]
Transferred securities at fair value from available for sale to held to maturity		$ 59.1	$ 18.7	$ 77.8
Net unrealized losses, related to securities transferred at fair value to held to maturity at a point in time		$ 5.4		$ 5.4
Subsequent Event
Subsequent Event [Line Items]
Transferred securities at fair value from available for sale to held to maturity	$ 5.0
Net unrealized losses, related to securities transferred at fair value to held to maturity at a point in time	$ 0.2