Investments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Net investment income	$ 2,779	$ 2,780	$ 2,395
Without hedge designation | Credit default swap index - purchased
Derivative [Line Items]
Notional amount		2,000
Derivative liability		1
Net investment income	$ 19	$ 1