Investments - Carrying amounts of other invested assets (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Investments [Line Items]
Alternative Investment		$ 7,803	$ 7,690
Investment real estate		1,690	1,932
All other investments		594	635
Total	[1]	10,087	10,257
Accumulated depreciation on investment in real estate		644	680
Fortitude Re Funds Withheld Assets
Investments [Line Items]
All other investments		156	156
Hedge Funds
Investments [Line Items]
Total		206	299
Private equity funds
Investments [Line Items]
Alternative Investment		5,739	5,541
Total		$ 7,600	$ 7,400

[1] See Note 8 for details of balances associated with variable interest entities