Contingencies, Commitments and Guarantees - Lease Commitments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Lease liability, balance sheet location	Other Liabilities	Other Liabilities
Right of use asset, balance sheet location	Other assets	Other assets
Lease liabilities	$ 868	$ 894
Right of use asset	696	744
Operating Lease, Lease Income, Lease Payments	$ 177	179
Leases, weighted average discount rate	3.36%
Leases, weighted average lease term	10 years 1 month 6 days
Rent expense	$ 164	$ 162	$ 174