Investment Securities (Details 3) $ in Millions	Jun. 30, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less than 12 months | security	64	5
Estimated Fair Value, Less than 12 months	$ 3,143	$ 477
Gross Unrealized Losses, Less than 12 months	$ (41)	$ (1)
90–100%
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less than 12 months | security	50	5
Estimated Fair Value, Less than 12 months	$ 3,112	$ 477
Gross Unrealized Losses, Less than 12 months	$ (34)	$ (1)
Less than 90%
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less than 12 months | security	14
Estimated Fair Value, Less than 12 months	$ 31
Gross Unrealized Losses, Less than 12 months	$ (7)