Investment gains (losses) (Tables)

3 Months Ended

Mar. 31, 2025

Investments, Debt and Equity Securities [Abstract]

Summary of investment gains (losses)

Investment gains (losses) are summarized as follows (in millions).

	First Quarter
	2025			2024
Investment gains (losses):
Equity securities:
Increase (decrease) in unrealized investment gains during the      period on securities held at the end of the period	$	(6,775	)	$	3,982
Investment gains (losses) on securities sold during the period		371			(2,104	)
		(6,404	)		1,878
Fixed maturity securities:
Gross realized gains		8			13
Gross realized losses		(47	)		(12	)
Other		8			(3	)
	$	(6,435	)	$	1,876