Reinsurance - Summary of the Composition of Pool of Assets (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Effects of Reinsurance [Line Items]
Fixed maturity securities - available for sale	$ 71,472		$ 71,032
Fixed maturity securities - fair value option	667		741
Short-term investments	9,063		11,141
Other	4,963		4,773
Total assets	163,464		161,254
Carrying Value
Effects of Reinsurance [Line Items]
Other	17		16
Commercial mortgage and other loans
Effects of Reinsurance [Line Items]
Loans, carrying value	2,263		2,495
Fortitude Holdings
Effects of Reinsurance [Line Items]
Change in net unrealized gains (losses), gross	0	$ 85
Change in net unrealized gains (losses), net of tax	0	$ 67
Derivative asset, Fair value of collateral	3		1
Derivative liability, Fair value of collateral	31		31
Fortitude Holdings \| Carrying Value
Effects of Reinsurance [Line Items]
Fixed maturity securities - available for sale	1,672		1,780
Fixed maturity securities - fair value option	657		734
Short-term investments	275		43
Funds withheld investment assets	2,873		2,916
Derivative assets, net	0		0
Other	37		137
Total assets	2,910		3,053
Fortitude Holdings \| Estimated Fair Value
Effects of Reinsurance [Line Items]
Fixed maturity securities - available for sale	1,672		1,780
Fixed maturity securities - fair value option	657		734
Short-term investments	275		43
Funds withheld investment assets	2,866		2,901
Derivative assets, net	0		0
Other, fair value	37		137
Total	2,903		3,038
Fortitude Holdings \| Commercial mortgage and other loans \| Carrying Value
Effects of Reinsurance [Line Items]
Loans, carrying value	269		359
Fortitude Holdings \| Commercial mortgage and other loans \| Estimated Fair Value
Effects of Reinsurance [Line Items]
Loans, fair value	$ 262		$ 344

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