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, 2025	Dec. 31, 2024
Securities Sold under Agreements to Repurchase [Abstract]
Gross amounts of recognized liabilities	$ 1,866	$ 2,096
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	1,866	2,096
Offsetting securities purchased under agreements to resell	0	0
Securities/ government guaranteed loans collateral	(1,866)	(2,096)
Net amount	$ 0	$ 0