Investment Information - Limited partnership interests (Details) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Maximum Exposure to Loss		$ 4,379	$ 3,905
Aggregate unfunded commitments		3,100	2,900
Equity method investments
Schedule of Equity Method Investments [Line Items]
Maximum Exposure to Loss	[1]	4,251	3,774
Aggregate unfunded commitments		3,000	2,600
Fair value option
Schedule of Equity Method Investments [Line Items]
Maximum Exposure to Loss	[2]	128	131
Aggregate unfunded commitments		$ 32	$ 17

[1] Aggregate unfunded commitments were $3.0 billion at September 30, 2023, compared with $2.6 billion at December 31, 2022.

[2] Aggregate unfunded commitments were $32 million at September 30, 2023, compared to $17 million at December 31, 2022.