Securities Financing Activities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
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	(4)	(5)
Securities borrowed	(500)	(500)
Total	(504)	(505)
Repurchase agreements	(143)	(167)
Total	(143)	(167)
Federal Agency CMOs
Securities Financing Transaction [Line Items]
Assets pledged as collateral	282
Liabilities pledged as collateral	143
Gross Amount Presented in Balance Sheet
Securities Financing Transaction [Line Items]
Reverse repurchase agreements	14	11
Securities borrowed	500	500
Total	514	511
Repurchase agreements	153	173
Total	153	173
Netting Adjustments
Securities Financing Transaction [Line Items]
Reverse repurchase agreements	(10)	(6)
Securities borrowed	0	0
Total	(10)	(6)
Repurchase agreements	(10)	(6)
Total	$ (10)	$ (6)