Acquisitions (Schedule of recognized identifiable assets acquired and liabilities assumed) (Details) - USD ($) $ in Millions		Jun. 30, 2023	Dec. 31, 2022	Jul. 01, 2022	Jun. 30, 2022	Dec. 31, 2021	Jan. 01, 2021
Business Acquisition [Line Items]
Accrued investment income		$ 983	$ 941
Insurance and reinsurance balances receivable		14,128	11,933
Reinsurance recoverable on losses and loss expenses	[1]	18,398	18,859
Reinsurance recoverable on policy benefits	[1]	315	302
Value of business acquired		3,575	3,702
Other assets		6,490	7,546
Total assets		205,448	199,017
Unpaid losses and loss expenses		76,480	75,747		$ 73,448	$ 72,330
Unearned premiums		21,860	19,713
Future policy benefits		11,064	10,476		6,756		$ 7,652
Insurance and reinsurance balances payable		8,429	7,780
Accounts payable, accrued expenses, and other liabilities		6,864	7,148
Deferred tax liabilities		533	377
Total liabilities		152,573	148,498
Net acquired assets, including goodwill		52,875	50,519		$ 51,268
Total liabilities and shareholders’ equity		$ 205,448	$ 199,017
Cigna's Life Insurance Business in Asia-Pacific Markets [Member]
Business Acquisition [Line Items]
Investments and Cash				$ 5,274
Accrued investment income				33
Insurance and reinsurance balances receivable				52
Reinsurance recoverable on losses and loss expenses				3
Reinsurance recoverable on policy benefits				85
Value of business acquired				3,633
Goodwill and intangible assets				1,486
Other assets				648
Total assets				11,214
Unpaid losses and loss expenses				12
Unearned premiums				60
Future policy benefits				3,856
Insurance and reinsurance balances payable				115
Accounts payable, accrued expenses, and other liabilities				926
Deferred tax liabilities				886
Total liabilities				5,855
Net acquired assets, including goodwill				5,359
Total liabilities and shareholders’ equity				$ 11,214

[1] Net of valuation allowance for uncollectible reinsurance.