Insurance and Contractholder Liabilities - Account Balances (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Current
Market risk benefits, current	$ 37	$ 51
Unearned premiums, current		576
Unearned premiums, current, including held for sale liabilities	846
Total, current	6,633
Current insurance and contractholder liabilities	5,514	5,409	[1]
Non-current
Market risk benefits, non-current	966	1,217
Unearned premiums, non-current		22
Unearned premiums, non-current, including held for sale liabilities	22
Total, non-current	11,421
Non-current insurance and contractholder liabilities	10,904	11,976	[1]
Total
Market risk benefits	1,003	1,268
Unearned premiums		598
Unearned premiums, including held for sale liabilities	868
Total	18,054
Total insurance and contractholder liabilities	16,418	17,385
Held-for-Sale | Medicare Advantage and related Cigna Healthcare businesses
Current
Insurance and contractholder liabilities current, classified as held for sale	(1,119)
Non-current
Insurance and contractholder liabilities, non-current, classified as held for sale	(517)
Total
Insurance and contractholder liabilities classified as held for sale	(1,636)
Unpaid claims classified as liabilities of business held for sale	823
Future policy benefits classified as liabilities of business held for sale	429
Unearned premiums classified as liabilities of business held for sale	261
Contractholder deposit funds classified as liabilities held for sale	123
Cigna Healthcare
Current
Unpaid claims and claim expenses, current		4,117
Unpaid claims and claim expenses, current, including held for sale liabilities	5,017
Future policy benefits, current		43
Future policy benefits, current, including held for sale liabilities	97
Contractholder deposit funds, current		14
Contractholder deposit funds, current, including held for sale liabilities	12
Non-current
Unpaid claims and claim expenses, non-current		59
Unpaid claims and claim expenses, non-current, including held for sale liabilities	75
Future policy benefits, non-current		544
Future policy benefits, non-current, including held for sale liabilities	518
Contractholder deposit funds, non-current		157
Contractholder deposit funds, non-current, including liabilities held for sale	133
Total
Unpaid claims and claim expenses		4,176		$ 4,261	$ 3,695
Unpaid claims and claim expenses, including held for sale liabilities	5,092
Total liability for future policy benefits		587
Future policy benefits, including held for sale liabilities	615
Contractholder deposit funds		171
Contractholder deposit funds, including liabilities held for sale	145
Other Operations
Current
Unpaid claims and claim expenses, current	99	107
Future policy benefits, current	163	150
Contractholder deposit funds, current	362	351
Non-current
Unpaid claims and claim expenses, non-current	154	177
Future policy benefits, non-current	3,375	3,442
Contractholder deposit funds, non-current	6,178	6,358
Total
Unpaid claims and claim expenses	253	284
Total liability for future policy benefits	3,538	3,592
Contractholder deposit funds	$ 6,540	$ 6,709		$ 6,900

[1] Amounts have been restated to reflect the adoption of Targeted Improvements to the Accounting for Long-Duration Contracts in 2023. See Note 2 to the Consolidated Financial Statements for further information.