Goodwill, Other Intangibles, and Property and Equipment - Property and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property and equipment, including held for sale assets
Cost	$ 12,437
Accumulated Amortization	8,566
Net Carrying Value	3,871
Total property and equipment
Cost		$ 11,204
Accumulated amortization		7,430
Net carrying value		3,774
Held-for-Sale | Medicare Advantage and related Cigna Healthcare businesses
Property and equipment classified as Assets of businesses held for sale
Property and equipment, net carrying value classified as assets of business held for sale	176
Internal-use software
Property and equipment, including held for sale assets
Cost	10,155
Accumulated Amortization	7,161
Net Carrying Value	2,994
Total property and equipment
Cost		8,948
Accumulated amortization		6,100
Net carrying value		2,848
Other property and equipment
Property and equipment, including held for sale assets
Cost	2,282
Accumulated Amortization	1,405
Net Carrying Value	$ 877
Total property and equipment
Cost		2,256
Accumulated amortization		1,330
Net carrying value		$ 926