Accounting Policies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Significant Accounting Policies [Line Items]
Cumulative effect of accounting change	$ (4,052)	$ (5,012)	$ (6,789)	$ (6,269)
Total assets	28,831	28,931
Liabilities of managed investment entities	$ 24,779	$ 23,919
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	200,000	500,000	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]
Total assets	$ 105
Liabilities of managed investment entities	102
AOCI attributable to parent
Significant Accounting Policies [Line Items]
Cumulative effect of accounting change	543	$ (119)	$ (1,273)	(863)
Retained Earnings
Significant Accounting Policies [Line Items]
Cumulative effect of accounting change	$ (3,142)	$ (3,478)	$ (4,149)	(4,009)
Cumulative effect, period of adoption, adjustment
Significant Accounting Policies [Line Items]
Cumulative effect of accounting change				(7)
Cumulative effect, period of adoption, adjustment | Retained Earnings
Significant Accounting Policies [Line Items]
Cumulative effect of accounting change				(7)
Accounting Standards Update 2016-13 | Cumulative effect, period of adoption, adjustment | Retained Earnings
Significant Accounting Policies [Line Items]
Cumulative effect of accounting change				$ (7)