Investment Securities (Details 2) $ in Millions	Mar. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Number of securities, less than 12 months | security	61	88
Estimated fair value, less than 12 months	$ 1,503	$ 4,311
Gross unrealized losses, less than 12 months	$ (14)	$ (83)
Number of securities, 12 months or more | security	22	3
Estimated fair value, 12 months or more	$ 2,153	$ 52
Gross unrealized losses, more than 12 months	$ (45)	$ (1)
Number of securities, total | security	83	91
Estimated fair value, total	$ 3,656	$ 4,363
Gross unrealized losses, total	$ (59)	$ (84)
90–100%
Debt Securities, Available-for-sale [Line Items]
Number of securities, less than 12 months | security	61	74
Estimated fair value, less than 12 months	$ 1,503	$ 4,287
Gross unrealized losses, less than 12 months	$ (14)	$ (74)
Number of securities, 12 months or more | security	19	3
Estimated fair value, 12 months or more	$ 2,137	$ 52
Gross unrealized losses, more than 12 months	$ (39)	$ (1)
Number of securities, total | security	80	77
Estimated fair value, total	$ 3,640	$ 4,339
Gross unrealized losses, total	$ (53)	$ (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	3	0
Estimated fair value, 12 months or more	$ 16	$ 0
Gross unrealized losses, more than 12 months	$ (6)	$ 0
Number of securities, total | security	3	14
Estimated fair value, total	$ 16	$ 24
Gross unrealized losses, total	$ (6)	$ (9)