Investment Securities (Details 2) $ in Millions	Jun. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-Sale [Line Items]
Number of securities, less than 12 months | security	24	88
Estimated fair value, less than 12 months	$ 1,009	$ 4,311
Gross unrealized losses, less than 12 months	$ (19)	$ (83)
Number of securities, 12 months or more | security	37	3
Estimated fair value, 12 months or more	$ 2,172	$ 52
Gross unrealized losses, more than 12 months	$ (39)	$ (1)
Number of securities, total | security	61	91
Estimated fair value, total	$ 3,181	$ 4,363
Gross unrealized losses, total	$ (58)	$ (84)
90–100%
Debt Securities, Available-for-Sale [Line Items]
Number of securities, less than 12 months | security	24	74
Estimated fair value, less than 12 months	$ 1,009	$ 4,287
Gross unrealized losses, less than 12 months	$ (19)	$ (74)
Number of securities, 12 months or more | security	23	3
Estimated fair value, 12 months or more	$ 2,147	$ 52
Gross unrealized losses, more than 12 months	$ (30)	$ (1)
Number of securities, total | security	47	77
Estimated fair value, total	$ 3,156	$ 4,339
Gross unrealized losses, total	$ (49)	$ (75)
Less than 90%
Debt Securities, Available-for-Sale [Line Items]
Number of securities, less than 12 months | security	0	14
Estimated fair value, less than 12 months	$ 0	$ 24
Gross unrealized losses, less than 12 months	$ 0	$ (9)
Number of securities, 12 months or more | security	14	0
Estimated fair value, 12 months or more	$ 25	$ 0
Gross unrealized losses, more than 12 months	$ (9)	$ 0
Number of securities, total | security	14	14
Estimated fair value, total	$ 25	$ 24
Gross unrealized losses, total	$ (9)	$ (9)