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Goodwill, Other intangible assets, and Value of business acquired (Roll-forward of Goodwill by Business Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | $ 16,228 |  | $ 15,213
Foreign exchange revaluation and other | 66 |  | (176)
Goodwill, Purchase Accounting Adjustments | (2) |  |
Balance at end of period | 19,686 | [1] | 16,228
goodwill attributable to noncontrolling interests | 759 |  |
North America Commercial P&C Insurance |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 6,945 |  | 6,972
Foreign exchange revaluation and other | 1 |  | (27)
Goodwill, Purchase Accounting Adjustments | 0 |  |
Balance at end of period | 6,946 | [1] | 6,945
North America Personal P&C Insurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 2,230 |  | 2,240
Foreign exchange revaluation and other | 1 |  | (10)
Goodwill, Purchase Accounting Adjustments | 0 |  |
Balance at end of period | 2,231 | [1] | 2,230
North America Agricultural Insurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 134 |  | 134
Foreign exchange revaluation and other | 0 |  | 0
Goodwill, Purchase Accounting Adjustments | 0 |  |
Balance at end of period | 134 | [1] | 134
Overseas General Insurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 4,605 |  | 4,653
Foreign exchange revaluation and other | 87 |  | (138)
Goodwill, Purchase Accounting Adjustments | 8 |  |
Balance at end of period | 5,262 | [1] | 4,605
Global Reinsurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 371 |  | 371
Foreign exchange revaluation and other | 0 |  | 0
Goodwill, Purchase Accounting Adjustments | 0 |  |
Balance at end of period | 371 | [1] | 371
Life Insurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 1,943 |  | 843
Foreign exchange revaluation and other | (23) |  | (1)
Goodwill, Purchase Accounting Adjustments | (10) |  |
Balance at end of period | 4,742 | [1] | 1,943
Cigna's Life Insurance Business in Asian Markets |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period |  |  | 1,191
Cigna's Life Insurance Business in Asian Markets | North America Commercial P&C Insurance |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period |  |  | 0
Cigna's Life Insurance Business in Asian Markets | North America Personal P&C Insurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period |  |  | 0
Cigna's Life Insurance Business in Asian Markets | North America Agricultural Insurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period |  |  | 0
Cigna's Life Insurance Business in Asian Markets | Overseas General Insurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period |  |  | 90
Cigna's Life Insurance Business in Asian Markets | Global Reinsurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period |  |  | 0
Cigna's Life Insurance Business in Asian Markets | Life Insurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period |  |  | $ 1,101
Huatai Group [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 3,394 |  |
Huatai Group [Member] | North America Commercial P&C Insurance |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 0 |  |
Huatai Group [Member] | North America Personal P&C Insurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 0 |  |
Huatai Group [Member] | North America Agricultural Insurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 0 |  |
Huatai Group [Member] | Overseas General Insurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 562 |  |
Huatai Group [Member] | Global Reinsurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 0 |  |
Huatai Group [Member] | Life Insurance [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | $ 2,832 |  |
[1] | At December 31, 2023, Goodwill from Huatai Group includes approximately $759 million attributable to noncontrolling interests

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