Investments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Net investment income	$ 2,780	$ 2,395	$ 1,802
Net gain related to the expected novation of a coinsurance agreement			$ 18
Without hedge designation | Credit default swap index - purchased
Derivative [Line Items]
Notional amount	2,000
Derivative liability	1
Net investment income	$ 1