Investment Information - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) lots	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) lots	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) lots
Continuous unrealized loss, qualitative disclosures:
Number of positions in an unrealized loss position (lots) | lots	6,710		6,710		7,100
Total number of positions (lots) | lots	19,840		19,840		15,720
Largest single loss	$ 4		$ 4		$ 6
Narrative items:
Equity securities, at fair value	1,623		1,623		$ 1,186
Equity in net (loss) income of investment funds accounted for using the equity method	$ 171	$ 59	$ 437	$ 176
Minimum
Narrative items:
Time lag for reporting			1 month
Maximum
Narrative items:
Time lag for reporting			3 months