Investment Information - Limited partnership interests (Details) - USD ($) $ in Millions		Jun. 30, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Maximum Exposure to Loss		$ 5,065	$ 4,680
Aggregate unfunded commitments		3,700	3,600
Equity method investments
Schedule of Equity Method Investments [Line Items]
Maximum Exposure to Loss	[1]	4,983	4,566
Aggregate unfunded commitments		3,500	3,400
Fair value option
Schedule of Equity Method Investments [Line Items]
Maximum Exposure to Loss	[2]	82	114
Aggregate unfunded commitments		$ 21	$ 32

[1] Aggregate unfunded commitments were $3.5 billion at June 30, 2024, compared with $3.4 billion at December 31, 2023.

[2] Aggregate unfunded commitments were $21 million at June 30, 2024, compared to $32 million at December 31, 2023