Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Significant Accounting Policies [Line Items]
Assets of managed investment entities	$ 28,762		$ 28,931
Liabilities of managed investment entities	23,927		23,919
Operating lease liability	$ 127		$ 136
Operating lease liability, current, Statement of Financial Position	Other Liabilities		Other Liabilities
Operating lease right-of-use asset	$ 111		$ 118
Weighted average common shares adjustment related to stock-based compensation (shares)	200,000	700,000
Anti-dilutive potential common shares related to stock-based compensation plans (shares)	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	$ 167
Liabilities of managed investment entities	$ 137