Commitments, Guarantees and Contingent Liabilities - Leases (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Operating lease, liability, extensible enumeration	Other liabilities and accrued expenses	Other liabilities and accrued expenses
Operating lease, right-of-use asset, extensible enumeration	Other assets, net	Other assets, net
Lease liability	$ 235	$ 265
Right of use asset	165	163
Lease, cost	92	102	$ 131
Variable lease, cost	$ 14	$ 19	$ 23
Minimum
Lessee, Lease, Description [Line Items]
Lease, term of contract (in years)	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease, term of contract (in years)	10 years