Investment Securities (Details 3) $ in Millions	Mar. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less than 12 months | security	48	5
Estimated Fair Value, Less than 12 months	$ 3,038	$ 477
Gross Unrealized Losses, Less than 12 months	$ (17)	$ (1)
90–100%
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less than 12 months | security	44	5
Estimated Fair Value, Less than 12 months	$ 3,032	$ 477
Gross Unrealized Losses, Less than 12 months	$ (16)	$ (1)
Less than 90%
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less than 12 months | security	4
Estimated Fair Value, Less than 12 months	$ 6
Gross Unrealized Losses, Less than 12 months	$ (1)