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	Mar. 31, 2026	Dec. 31, 2025
SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE
Gross amounts of recognized liabilities	$ 1,400	$ 1,973
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	1,400	1,973
Offsetting securities purchased under agreements to resell	(18)	(5)
Securities/ government guaranteed loans collateral	(1,382)	(1,968)
Net amount	$ 0	$ 0