Investment Securities (Details 1) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Estimated fair value, less than 12 months	$ 4,361	$ 477
Gross unrealized losses, less than 12 months	(89)	(1)
Estimated fair value, 12 months or more	48	0
Gross unrealized losses, more than 12 months	(2)	0
State and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Estimated fair value, less than 12 months	52	0
Gross unrealized losses, less than 12 months	(11)	0
Estimated fair value, 12 months or more	0	0
Gross unrealized losses, more than 12 months	0	0
U.S. Government treasury obligations
Debt Securities, Available-for-sale [Line Items]
Estimated fair value, less than 12 months	3,709	477
Gross unrealized losses, less than 12 months	(75)	(1)
Estimated fair value, 12 months or more	48	0
Gross unrealized losses, more than 12 months	(2)	0
Foreign government bonds and obligations
Debt Securities, Available-for-sale [Line Items]
Estimated fair value, less than 12 months	600	0
Gross unrealized losses, less than 12 months	(3)	0
Estimated fair value, 12 months or more	0	0
Gross unrealized losses, more than 12 months	$ 0	$ 0