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	Dec. 31, 2024	Dec. 31, 2023
Securities Sold under Agreements to Repurchase [Abstract]
Gross amounts of recognized liabilities	$ 2,096	$ 1,921
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	2,096	1,921
Offsetting securities purchased under agreements to resell	0	0
Securities/ government guaranteed loans collateral	(2,096)	(1,921)
Net amount	$ 0	$ 0