Master Netting and Similar Agreements—Repurchase, Reverse Repurchase, and Securities Borrowing Transactions - Securities Sold Under Agreements To Repurchase And Collateral Pledged By Company (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Securities Sold under Agreements to Repurchase [Abstract]
Gross amounts of recognized liabilities	$ 1,707	$ 1,013
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	1,707	1,013
Offsetting securities purchased under agreements to resell	0	(10)
Securities/ government guaranteed loans collateral	(1,707)	(1,003)
Net amount	$ 0	$ 0