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Reinsurance (Tables)
 3 Months Ended
Mar. 31, 2024
Reinsurance Disclosures [Abstract]  
Schedule of Assets in Support of Reserves We held investments with a carrying value of $9.8 billion and $9.9 billion in support of reserves associated with the Fortitude Re transaction in a funds withheld arrangement as of March 31, 2024, and December 31, 2023, respectively, which consisted of the following (in millions):
As of
March 31,		As of
December 31,
20242023
Fixed maturity AFS securities$8,651 $8,867 
Other investments1,002 759 
Cash and invested cash34 141 
Accrued investment income107 103 
Other assets5 1 
Total$9,799 $9,871