Acquisitions (Schedule of recognized identifiable assets acquired and liabilities assumed) (Details) - USD ($) $ in Millions		May 31, 2024	Jul. 01, 2022	Dec. 31, 2024		Dec. 31, 2023	Jul. 01, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Accrued investment income				$ 1,160		$ 1,086
Insurance and reinsurance balances receivable				14,426		13,379
Reinsurance recoverable on losses and loss expenses	[1]			19,777		19,952
Reinsurance recoverable on policy benefits				289		280
Value of business acquired				3,223		3,674		$ 3,702	$ 235
Other assets				7,503		7,508
Total assets				246,548		230,682
Unpaid losses and loss expenses				84,004		80,122		75,747	$ 72,330
Unearned premiums				23,504		22,051
Future policy benefits				16,121		13,888
Policyholders' account balances				8,016		7,462
Insurance and reinsurance balances payable				8,121		8,302
Accounts Payable and Accrued Liabilities				10,192		8,332
Deferred tax liabilities				1,584		1,555
Repurchase agreements				2,731		2,833
Total liabilities				178,154		166,991
Stockholders' Equity				64,021		59,507		50,519
Noncontrolling interests				4,373		4,184
Total shareholders’ equity				68,394		63,691		50,519
Total liabilities and shareholders’ equity				246,548		230,682
Other intangible assets				6,377		6,775
Goodwill				$ 19,579	[2]	$ 19,686		$ 16,228
Cigna's Life Insurance Business in Asian Markets
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross			$ 5,400
Huatai Group [Member]
Business Acquisition [Line Items]
Investments and Cash							$ 13,346
Accrued investment income							60
Insurance and reinsurance balances receivable							277
Reinsurance recoverable on losses and loss expenses							581
Reinsurance recoverable on policy benefits							27
Value of business acquired							309
Goodwill and intangible assets							5,113
Other assets							748
Total assets							20,461
Unpaid losses and loss expenses							831
Unearned premiums							800
Future policy benefits							2,351
Policyholders' account balances							4,014
Insurance and reinsurance balances payable							644
Accounts Payable and Accrued Liabilities							682
Deferred tax liabilities							232
Repurchase agreements							1,269
Total liabilities							10,823
Stockholders' Equity							4,428
Noncontrolling interests							5,210
Total shareholders’ equity							9,638
Other intangible assets							1,655
Goodwill							$ 3,458
Healthy Paws
Business Acquisition [Line Items]
Other intangible assets		$ 44
Payments to Acquire Businesses, Gross		300
Goodwill		$ 256

[1] Net of valuation allowance for uncollectible reinsurance.

[2] Includes $499 million attributable to noncontrolling interests