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Investment Information - Net investment income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net investment income:
Gross investment income		$ 260	$ 123	$ 479	$ 226
Investment expenses		(18)	(17)	(38)	(40)
Net investment income		242	106	441	186
Fixed maturities
Net investment income:
Gross investment income		214	105	402	187
Equity securities
Net investment income:
Gross investment income		6	6	10	12
Short-term investments
Net investment income:
Gross investment income		15	4	29	7
Other
Net investment income:
Gross investment income	[1]	$ 25	$ 8	$ 38	$ 20
[1] Amounts include dividends and other distributions on investment funds, term loan investments, funds held balances, cash balances and other items.

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