Investments - Equity Security Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021	[1]
Cost
Equity securities with readily determinable fair values	$ 656	$ 673
Equity securities with no readily determinable fair value	3,248	380
Total	3,904	1,053
Carrying Value
Equity securities with readily determinable fair values	51	138
Equity securities with no readily determinable fair value	3,311	484
Total	3,362	622
Other Commitments [Line Items]
Amount funded	$ 4,334	$ 2,756	[1]	$ 3,553
Equity Securities FV NI | Product Concentration Risk | Health Care Sector
Other Commitments [Line Items]
Concentration percentage	95.00%

[1] Amounts have been restated to reflect the adoption of Targeted Improvements to the Accounting for Long-Duration Contracts in 2023. See Note 2 to the Consolidated Financial Statements for further information.