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Goodwill, Other intangible assets, and Value of business acquired (VOBA) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
VOBA Roll Forward      
VOBA balance, beginning of year $ 3,702 $ 235 $ 263
Amortization of Value of Business Acquired (VOBA) [1] (281) (149) (23)
Foreign exchange revaluation and other (56) (17) (5)
VOBA balance, end of year 3,674 3,702 235
Present Value of Future Insurance Profit [Line Items]      
present value of future insurance 1,035    
Huatai Group [Member]      
VOBA Roll Forward      
Present Value of Future Insurance Profits, Addition from Acquisition 309 0 0
Present Value of Future Insurance Profit [Line Items]      
Present Value of Future Insurance Profits, Addition from Acquisition 309 0 0
Cigna's Life Insurance Business in Asian Markets      
VOBA Roll Forward      
Present Value of Future Insurance Profits, Addition from Acquisition 0 3,633 0
Present Value of Future Insurance Profit [Line Items]      
Present Value of Future Insurance Profits, Addition from Acquisition $ 0 $ 3,633 $ 0
[1] Recognized in Policy acquisition costs in the Consolidated statements of operations.