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Goodwill, Other intangible assets, and Value of business acquired (VOBA) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Present Value of Future Insurance Profit [Line Items]      
VOBA balance, beginning of year $ 3,674 $ 3,702 $ 235
Amortization of Value of Business Acquired (VOBA) [1] (240) (281) (149)
Foreign exchange revaluation and other (211) (56) (17)
VOBA balance, end of year 3,223 3,674 3,702
Huatai Group [Member]      
Present Value of Future Insurance Profit [Line Items]      
Present Value of Future Insurance Profits, Addition from Acquisition 0 309 0
Cigna's Life Insurance Business in Asian Markets      
Present Value of Future Insurance Profit [Line Items]      
Present Value of Future Insurance Profits, Addition from Acquisition $ 0 $ 0 $ 3,633
[1] Recognized in Policy acquisition costs in the Consolidated statements of operations.