Investment Information - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) lots	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) lots	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) lots
Continuous unrealized loss, qualitative disclosures:
Number of positions in an unrealized loss position (lots) | lots	9,510		9,510		7,100
Total number of positions (lots) | lots	18,390		18,390		15,720
Largest single loss	$ 5		$ 5		$ 6
Narrative items:
Equity securities, at fair value	1,397		1,397		$ 1,186
Equity in net (loss) income of investment funds accounted for using the equity method	$ 167	$ 69	$ 266	$ 117
Minimum
Narrative items:
Time lag for reporting			1 month
Maximum
Narrative items:
Time lag for reporting			3 months