Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Significant Accounting Policies [Line Items]
Assets of managed investment entities	$ 28,084		$ 28,084		$ 28,931
Liabilities of managed investment entities	24,017		24,017		23,919
Operating lease liability	$ 124		$ 124		$ 136
Operating lease liability, current, Statement of Financial Position	Other Liabilities		Other Liabilities		Other Liabilities
Operating lease right-of-use asset	$ 108		$ 108		$ 118
Weighted average common shares adjustment related to stock-based compensation (shares)	200,000	600,000	200,000	600,000
Anti-dilutive potential common shares related to stock-based compensation plans (shares)	0	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	$ 40		$ 40
Liabilities of managed investment entities	$ 40		$ 40