Insurance and Contractholder Liabilities - Account Balances (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Current
Contractholder deposit funds	$ 368	$ 352
Future policy benefits	237	312
Unearned premiums	619	558
Total	6,186	5,929
Insurance and contractholder liabilities classified as held for sale	(513)	(611)
Current insurance and contractholder liabilities	5,673	5,318
Non-current
Contractholder deposit funds	6,641	6,702
Future policy benefits	8,896	9,194
Unearned premiums	416	418
Total	16,216	16,596
Insurance and contractholder liabilities classified as held for sale	(4,049)	(4,033)
Non-current insurance and contractholder liabilities	12,167	12,563
Total
Contractholder deposit funds	7,009	7,054	$ 7,161
Future policy benefits	9,133	9,506
Unearned premiums	1,035	976
Future policy benefits			9,306
Unearned premiums			950
Total	22,402	22,525
Insurance and contractholder liabilities classified as held for sale	(4,562)	(4,644)
Total insurance and contractholder liabilities	17,840	17,881	22,167
Future policy benefits classified as liabilities of business held for sale	3,700	3,800
Unpaid claims classified as liabilities of business held for sale	400	400
Contractholder deposit funds classified as liabilities of business held for sale	400	400
Cigna Healthcare
Current
Unpaid claims and claim expenses	4,459	4,159
Non-current
Unpaid claims and claim expenses	32	102
Total
Unpaid claims and claim expenses	4,491	4,261
Unpaid claims and claim expenses	4,491	4,261	4,027	$ 3,695
Other Operations
Current
Unpaid claims and claim expenses	503	548
Non-current
Unpaid claims and claim expenses	231	180
Total
Unpaid claims and claim expenses	$ 734	$ 728
Unpaid claims and claim expenses			$ 723