Acquisitions (Narrative) (Details) - USD ($) $ in Millions				9 Months Ended
	Oct. 01, 2023	Jul. 01, 2023	Jul. 01, 2022	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Goodwill				$ 19,554		$ 16,228
Other intangible assets				6,844		5,441
Value of business acquired				3,675		3,702
Repurchase agreements (refer to Note 3 for balances associated with VIEs)				$ 2,617		$ 1,419
Huatai Group
Business Acquisition [Line Items]
Subsidiary, Ownership Percentage, Parent		69.60%		69.60%
Additional 5.4 percent ownership interest obtained in subsidiary		5.40%
Subsidiary, Ownership Percentage, Noncontrolling Owner		30.40%
Outstanding 14.1 percent additional ownership interest agreed on				14.10%
Outstanding 3.0 percent ownership interest agreed on requiring regulatory approval				3.00%
Huatai Group | Subsequent Event [Member]
Business Acquisition [Line Items]
Additional 2.5 percent ownership interest obtained in subsidiary	2.50%
Huatai Group
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage					64.20%
Cigna's Life Insurance Business in Asia-Pacific Markets [Member]
Business Acquisition [Line Items]
Goodwill			$ 1,177
Other intangible assets			309
Value of business acquired			$ 3,633
Business Acquisition, Effective Date of Acquisition			Jul. 01, 2022
Payments to Acquire Businesses, Gross			$ 5,400
Repurchase agreements (refer to Note 3 for balances associated with VIEs)			$ 2,000
Huatai Group
Business Acquisition [Line Items]
Payments to Acquire Additional Interest in Subsidiaries		$ 318
Deposits previously paid on additional ownership interest agreed on				$ 416
Outstanding payment to be made on additional ownership interest agreed on				$ 433
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value		4,100
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain		744
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Loss		17
Write-off of Accumulated AOCI Loss Balance, Equity Method Invesmtent		611
Business combination, Realized Gain (Loss) from Write-off of AOCI		(628)
Goodwill		3,394
Other intangible assets		1,655
Value of business acquired		309
Repurchase agreements (refer to Note 3 for balances associated with VIEs)		$ 1,269
Huatai Group | Subsequent Event [Member]
Business Acquisition [Line Items]
Deposits previously paid on additional ownership interest obtained	$ 146