Investments - Investments by Category (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Current
Investments including held for sale assets	$ 1,009
Current investments	925	$ 905	[1]
Long-term
Investments including held for sale assets	19,339
Investments per Consolidated Balance Sheets	17,985	16,288	[1]
Total
Investments including held for sale assets	20,348
Total investments	18,910	17,193
Held-for-Sale | Medicare Advantage and related Cigna Healthcare businesses
Current
Investments classified as assets of business held for sale	(84)
Long-term
Investments classified as assets of business held for sale	(1,354)
Total
Investments classified as assets of business held for sale	(1,438)
Debt securities
Current
Investments including held for sale assets	590
Current investments		654
Long-term
Investments including held for sale assets	9,265
Investments per Consolidated Balance Sheets		9,218
Total
Investments including held for sale assets	9,855
Total investments		9,872
Equity securities
Current
Investments including held for sale assets	31
Current investments		45
Long-term
Investments including held for sale assets	3,331
Investments per Consolidated Balance Sheets		577
Total
Investments including held for sale assets	3,362
Total investments		622
Commercial mortgage loans
Current
Investments including held for sale assets	182
Current investments		67
Long-term
Investments including held for sale assets	1,351
Investments per Consolidated Balance Sheets		1,547
Total
Investments including held for sale assets	1,533
Total investments		1,614
Policy loans
Current
Investments including held for sale assets	0
Current investments		0
Long-term
Investments including held for sale assets	1,211
Investments per Consolidated Balance Sheets		1,218
Total
Investments including held for sale assets	1,211
Total investments		1,218
Other long-term investments
Current
Investments including held for sale assets	0
Current investments		0
Long-term
Investments including held for sale assets	4,181
Investments per Consolidated Balance Sheets		3,728
Total
Investments including held for sale assets	4,181
Total investments		3,728
Short-term investments
Current
Investments including held for sale assets	206
Current investments		139
Long-term
Investments including held for sale assets	0
Investments per Consolidated Balance Sheets		0
Total
Investments including held for sale assets	$ 206
Total investments		$ 139

[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.