Securities Financing Activities (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Securities Financing Transaction [Line Items]
Reverse repurchase agreements	$ 0	$ 0
Securities borrowed	0	0
Total	0	0
Repurchase agreements	0	0
Total	0	0
Collateral
Securities Financing Transaction [Line Items]
Reverse repurchase agreements	(3)	0
Securities borrowed	0	0
Total	(3)	0
Repurchase agreements	(22)	(31)
Total	(22)	(31)
Federal Agency CMOs
Securities Financing Transaction [Line Items]
Assets pledged as collateral	25
Liabilities pledged as collateral	22
Gross Amount Presented in Balance Sheet
Securities Financing Transaction [Line Items]
Reverse repurchase agreements	6	7
Securities borrowed	0	0
Total	6	7
Repurchase agreements	25	38
Total	25	38
Netting Adjustments
Securities Financing Transaction [Line Items]
Reverse repurchase agreements	(3)	(7)
Securities borrowed	0	0
Total	(3)	(7)
Repurchase agreements	(3)	(7)
Total	$ (3)	$ (7)