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Reinsurance (Tables)
 3 Months Ended
Mar. 31, 2025
Reinsurance Disclosures [Abstract]  
Schedule of Assets in Support of Reserves We held investments with a carrying value of $9.2 billion and $9.3 billion in support of reserves associated with the Fortitude Re transaction in a funds withheld arrangement as of March 31, 2025, and December 31, 2024, respectively, which consisted of the following (in millions):
As of
March 31, 		As of
December 31,
20252024
Fixed maturity AFS securities$7,549 $7,764 
Derivative investments19 30 
Other investments1,465 1,419 
Cash and invested cash104 28 
Accrued investment income93 96 
Total$9,230 $9,337