Contingencies, Commitments and Guarantees - Lease Commitments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Lease liability, balance sheet location	Other liabilities(c)	Other liabilities(c)
Right of use asset, balance sheet location	Other assets	Other assets
Lease liabilities	$ 919	$ 1,100
Right of use asset	767	880
Operating Lease, Lease Income, Lease Payments	$ 197	205
Leases, weighted average discount rate	2.96%
Leases, weighted average lease term	10 years 2 months 12 days
Rent expense	$ 177	$ 190	$ 237