Investment Securities (Details 2) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 months	$ 3,143	$ 477
Gross Unrealized Losses, Less than 12 months	(41)	(1)
State and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 months	40	0
Gross Unrealized Losses, Less than 12 months	(8)	0
U.S. Government treasury obligations
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 months	2,553	477
Gross Unrealized Losses, Less than 12 months	(31)	(1)
Foreign government bonds and obligations
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 months	550	0
Gross Unrealized Losses, Less than 12 months	$ (2)	$ 0