Accounting Policies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Significant Accounting Policies [Line Items]
Assets of managed investment entities	$ 4,484	$ 5,447
Liabilities of managed investment entities	$ 4,307	$ 5,332
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities	Other Liabilities
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Weighted average common shares adjustment related to stock-based compensation	100,000	200,000	500,000
Anti-dilutive potential common shares related to stock-based compensation plans	0	0	0
Maturities of short term investments	3 months
New collateralized loan obligation, temporary warehousing entities
Significant Accounting Policies [Line Items]
Assets of managed investment entities	$ 263
Liabilities of managed investment entities	$ 225