Accounting Policies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Businesses shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 shares
Significant Accounting Policies [Line Items]
Number of businesses acquired during period | Businesses	2
Assets of managed investment entities	$ 4,140	$ 4,484
Liabilities of managed investment entities	$ 3,965	$ 4,307
Weighted average common shares adjustment related to stock-based compensation | shares		100,000	200,000
Anti-dilutive potential common shares related to stock-based compensation plans | shares	0	0	0
Maturities of short term investments	3 months
Maximum
Significant Accounting Policies [Line Items]
Weighted average common shares adjustment related to stock-based compensation | shares	100,000
New collateralized loan obligation, temporary warehousing entities
Significant Accounting Policies [Line Items]
Assets of managed investment entities	$ 302
Liabilities of managed investment entities	$ 253