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Future policy benefits (Rollforward) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jul. 01, 2023 | Jul. 01, 2022 | Jan. 01, 2021 | Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  | $ 13,888 |  | $ 10,476 |  | $ 7,837 |  |  |  | $ 7,652 |
Weighted-average duration (years) |  | 19 years 4 months 24 days |  | 17 years 6 months |  | 17 years 1 month 6 days |  |  |  |  |
Cigna's Life Insurance Business in Asian Markets |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  |  |  |  |  |  |  |  | $ 3,856 |  |
Huatai Group [Member] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  |  |  |  |  |  |  | $ 2,287 |  |  |
Life Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance – beginning of period |  | $ 14,867 |  | $ 4,315 |  | $ 4,583 |  |  |  |  |
Beginning balance at original discount rate |  | 16,693 |  | 15,529 |  | 3,993 |  |  |  |  | $ 3,953
Effect of changes in cash flow assumptions |  |  |  | (756) |  | 13 |  |  |  |  | (33)
Effect of actual variances from expected experience |  |  |  | (5) |  | (95) |  |  |  |  | (169)
Adjusted beginning of period balance |  | 14,768 |  | 3,911 |  | 3,751 |  |  |  |  |
Acquisition |  | 1,850 |  | 11,571 |  |  |  |  |  |  |
Issuances |  | 2,170 |  | 1,044 |  | 553 |  |  |  |  |
Interest accrual |  | 691 |  | 436 |  | 312 |  |  |  |  |
Net premiums collected (1) |  | (2,320) | [1] | (1,332) | [2] | (543) | [3] |  |  |  |
Other (including foreign exchange) |  | 466 |  | (101) |  | (80) |  |  |  |  |
Ending balance at original discount rate |  |  |  | 14,768 |  | 3,911 |  |  |  |  |
Effect of changes in discount rate assumptions |  | (657) |  | (662) |  | 322 |  |  |  |  |
Balance – end of period |  | 16,036 |  | 14,867 |  | 4,315 |  |  |  |  |
Balance – beginning of period |  | 23,324 |  | 10,387 |  | 11,100 |  |  |  |  |
Beginning balance at original discount rate |  | 28,303 |  | 24,456 |  | 9,019 |  |  |  |  | 8,905
Effect of changes in cash flow assumptions |  |  |  | (795) |  | 17 |  |  |  |  | (36)
Effect of actual variances from expected experience |  |  |  | 15 |  | (102) |  |  |  |  | (166)
Adjusted beginning of period balance |  | 23,676 |  | 8,934 |  | 8,703 |  |  |  |  |
Acquisition |  | 4,072 |  | 15,447 |  |  |  |  |  |  |
Issuances |  | 2,170 |  | 1,044 |  | 553 |  |  |  |  |
Interest accrual |  | 1,023 |  | 664 |  | 480 |  |  |  |  |
Benefits payments |  | (2,135) |  | (1,285) |  | (613) |  |  |  |  |
Other (including foreign exchange) |  | (503) |  | 348 |  | 104 |  |  |  |  |
Ending balance at original discount rate |  |  |  | 23,676 |  | 8,934 |  |  |  |  |
Effect of changes in discount rate assumptions |  | (841) |  | (1,132) |  | 1,368 |  |  |  |  |
Balance – end of period |  | 27,462 |  | 23,324 |  | 10,387 |  |  |  |  |
Net liability for future policy benefits |  | 11,426 |  | 8,457 |  | 6,072 |  |  |  |  |
Deferred profit liability |  | 1,253 |  | 869 |  | 613 |  |  |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  | 12,679 |  | 9,326 |  | 6,685 |  |  |  |  |
Less: Reinsurance recoverable on future policy benefits |  | 233 |  | 251 |  | 210 |  |  |  |  |
Net liability for future policy benefits, after reinsurance recoverable |  | 12,446 |  | 9,075 |  | 6,475 |  |  |  |  |
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net liability for future policy benefits, per consolidated balance sheet | [4] | 1,209 |  | 1,150 |  | 1,152 |  |  |  |  |
Term Life Insurance | Life Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance – beginning of period |  | 1,806 |  | 422 |  | 371 |  |  |  |  |
Beginning balance at original discount rate |  | 1,992 |  | 1,867 |  | 397 |  |  |  |  | 322
Effect of changes in cash flow assumptions |  |  |  | 22 |  | 35 |  |  |  |  | (4)
Effect of actual variances from expected experience |  |  |  | (9) |  | (35) |  |  |  |  | (82)
Adjusted beginning of period balance |  | 1,880 |  | 397 |  | 236 |  |  |  |  |
Issuances |  | 190 |  | 169 |  | 183 |  |  |  |  |
Interest accrual |  | 71 |  | 71 |  | 97 |  |  |  |  |
Net premiums collected (1) |  | (255) | [1] | (185) | [2] | (107) | [3] |  |  |  |
Other (including foreign exchange) |  | (103) |  | 54 |  | (12) |  |  |  |  |
Ending balance at original discount rate |  |  |  | 1,880 |  | 397 |  |  |  |  |
Effect of changes in discount rate assumptions |  | (402) |  | (61) |  | 25 |  |  |  |  |
Balance – end of period |  | 1,590 |  | 1,806 |  | 422 |  |  |  |  |
Balance – beginning of period |  | 2,321 |  | 832 |  | 739 |  |  |  |  |
Beginning balance at original discount rate |  | 2,749 |  | 2,447 |  | 775 |  |  |  |  | 630
Effect of changes in cash flow assumptions |  |  |  | 15 |  | 34 |  |  |  |  | (7)
Effect of actual variances from expected experience |  |  |  | (4) |  | (36) |  |  |  |  | (73)
Adjusted beginning of period balance |  | 2,458 |  | 773 |  | 550 |  |  |  |  |
Issuances |  | 190 |  | 169 |  | 183 |  |  |  |  |
Interest accrual |  | 90 |  | 83 |  | 105 |  |  |  |  |
Benefits payments |  | (238) |  | (176) |  | (102) |  |  |  |  |
Other (including foreign exchange) |  | 232 |  | (5) |  | (39) |  |  |  |  |
Ending balance at original discount rate |  |  |  | 2,458 |  | 773 |  |  |  |  |
Effect of changes in discount rate assumptions |  | (495) |  | (126) |  | 57 |  |  |  |  |
Balance – end of period |  | 2,254 |  | 2,321 |  | 832 |  |  |  |  |
Net liability for future policy benefits |  | 664 |  | 515 |  | 410 |  |  |  |  |
Deferred profit liability |  | 267 |  | 201 |  | 128 |  |  |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  | 931 |  | 716 |  | 538 |  |  |  | 454 |
Less: Reinsurance recoverable on future policy benefits |  | 82 |  | 93 |  | 119 |  |  |  |  |
Net liability for future policy benefits, after reinsurance recoverable |  | $ 849 |  | $ 623 |  | $ 419 |  |  |  |  |
Weighted-average duration (years) |  | 10 years 6 months |  | 9 years 2 months 12 days |  | 10 years 7 months 6 days |  |  |  |  |
Term Life Insurance | Life Insurance [Member] | Cigna's Life Insurance Business in Asian Markets |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  | $ 1,361 |  |  |  |  |  |  |
Acquisition |  |  |  | 1,593 |  |  |  |  |  |  |
Term Life Insurance | Life Insurance [Member] | Huatai Group [Member] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition |  | $ 3 |  |  |  |  |  |  |  |  |
Acquisition |  | 17 |  |  |  |  |  |  |  |  |
Whole Life Insurance | Life Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance – beginning of period |  | 2,308 |  | 1,343 |  | $ 1,395 |  |  |  |  |
Beginning balance at original discount rate |  | 3,945 |  | 2,361 |  | 1,245 |  |  |  |  | 1,201
Effect of changes in cash flow assumptions |  |  |  | 40 |  | 3 |  |  |  |  | (24)
Effect of actual variances from expected experience |  |  |  | 88 |  | 69 |  |  |  |  | 2
Adjusted beginning of period balance |  | 2,489 |  | 1,317 |  | 1,179 |  |  |  |  |
Issuances |  | 318 |  | 230 |  | 229 |  |  |  |  |
Interest accrual |  | 87 |  | 55 |  | 51 |  |  |  |  |
Net premiums collected (1) |  | (585) | [1] | (273) | [2] | (161) | [3] |  |  |  |
Other (including foreign exchange) |  | 54 |  | (50) |  | (53) |  |  |  |  |
Ending balance at original discount rate |  |  |  | 2,489 |  | 1,317 |  |  |  |  |
Effect of changes in discount rate assumptions |  | 5 |  | (53) |  | 98 |  |  |  |  |
Balance – end of period |  | 3,950 |  | 2,308 |  | 1,343 |  |  |  |  |
Balance – beginning of period |  | 5,696 |  | 4,493 |  | 4,886 |  |  |  |  |
Beginning balance at original discount rate |  | 9,991 |  | 5,874 |  | 3,540 |  |  |  |  | 3,503
Effect of changes in cash flow assumptions |  |  |  | 44 |  | 5 |  |  |  |  | (24)
Effect of actual variances from expected experience |  |  |  | 98 |  | 72 |  |  |  |  | (2)
Adjusted beginning of period balance |  | 6,016 |  | 3,617 |  | 3,477 |  |  |  |  |
Issuances |  | 318 |  | 230 |  | 229 |  |  |  |  |
Interest accrual |  | 252 |  | 176 |  | 152 |  |  |  |  |
Benefits payments |  | (333) |  | (248) |  | (174) |  |  |  |  |
Other (including foreign exchange) |  | 79 |  | 179 |  | 144 |  |  |  |  |
Ending balance at original discount rate |  |  |  | 6,016 |  | 3,617 |  |  |  |  |
Effect of changes in discount rate assumptions |  | 72 |  | (178) |  | 953 |  |  |  |  |
Balance – end of period |  | 10,063 |  | 5,696 |  | 4,493 |  |  |  |  |
Net liability for future policy benefits |  | 6,113 |  | 3,388 |  | 3,150 |  |  |  |  |
Deferred profit liability |  | 804 |  | 531 |  | 387 |  |  |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  | 6,917 |  | 3,919 |  | 3,537 |  |  |  | 3,767 |
Less: Reinsurance recoverable on future policy benefits |  | 45 |  | 49 |  | 51 |  |  |  |  |
Net liability for future policy benefits, after reinsurance recoverable |  | $ 6,872 |  | $ 3,870 |  | $ 3,486 |  |  |  |  |
Weighted-average duration (years) |  | 25 years 9 months 18 days |  | 25 years 1 month 6 days |  | 21 years 6 months |  |  |  |  |
Whole Life Insurance | Life Insurance [Member] | Cigna's Life Insurance Business in Asian Markets |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  | $ 1,082 |  |  |  |  |  |  |
Acquisition |  |  |  | 2,278 |  |  |  |  |  |  |
Whole Life Insurance | Life Insurance [Member] | Huatai Group [Member] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition |  | $ 1,690 |  |  |  |  |  |  |  |  |
Acquisition |  | 3,659 |  |  |  |  |  |  |  |  |
Accident and Health [Member] | Life Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance – beginning of period |  | 10,711 |  | 2,520 |  | $ 2,782 |  |  |  |  |
Beginning balance at original discount rate |  | 10,692 |  | 11,258 |  | 2,323 |  |  |  |  | 2,398
Effect of changes in cash flow assumptions |  |  |  | (820) |  | (25) |  |  |  |  | (4)
Effect of actual variances from expected experience |  |  |  | (84) |  | (129) |  |  |  |  | (89)
Adjusted beginning of period balance |  | 10,354 |  | 2,169 |  | 2,305 |  |  |  |  |
Issuances |  | 1,653 |  | 639 |  | 135 |  |  |  |  |
Interest accrual |  | 531 |  | 309 |  | 164 |  |  |  |  |
Net premiums collected (1) |  | (1,457) | [1] | (859) | [2] | (270) | [3] |  |  |  |
Other (including foreign exchange) |  | 534 |  | (105) |  | (11) |  |  |  |  |
Ending balance at original discount rate |  |  |  | 10,354 |  | 2,169 |  |  |  |  |
Effect of changes in discount rate assumptions |  | (260) |  | (547) |  | 197 |  |  |  |  |
Balance – end of period |  | 10,432 |  | 10,711 |  | 2,520 |  |  |  |  |
Balance – beginning of period |  | 15,038 |  | 4,935 |  | 5,351 |  |  |  |  |
Beginning balance at original discount rate |  | 15,071 |  | 15,855 |  | 4,585 |  |  |  |  | 4,668
Effect of changes in cash flow assumptions |  |  |  | (858) |  | (37) |  |  |  |  | (4)
Effect of actual variances from expected experience |  |  |  | (78) |  | (138) |  |  |  |  | (90)
Adjusted beginning of period balance |  | 14,919 |  | 4,410 |  | 4,574 |  |  |  |  |
Issuances |  | 1,653 |  | 639 |  | 135 |  |  |  |  |
Interest accrual |  | 672 |  | 401 |  | 221 |  |  |  |  |
Benefits payments |  | (1,551) |  | (855) |  | (337) |  |  |  |  |
Other (including foreign exchange) |  | (785) |  | 181 |  | 8 |  |  |  |  |
Ending balance at original discount rate |  |  |  | 14,919 |  | 4,410 |  |  |  |  |
Effect of changes in discount rate assumptions |  | (421) |  | (817) |  | 350 |  |  |  |  |
Balance – end of period |  | 14,650 |  | 15,038 |  | 4,935 |  |  |  |  |
Net liability for future policy benefits |  | 4,218 |  | 4,327 |  | 2,415 |  |  |  |  |
Deferred profit liability |  | 165 |  | 126 |  | 94 |  |  |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  | 4,383 |  | 4,453 |  | 2,509 |  |  |  | 2,569 |
Less: Reinsurance recoverable on future policy benefits |  | 106 |  | 109 |  | 40 |  |  |  |  |
Net liability for future policy benefits, after reinsurance recoverable |  | $ 4,277 |  | $ 4,344 |  | $ 2,469 |  |  |  |  |
Weighted-average duration (years) |  | 10 years 4 months 24 days |  | 10 years 8 months 12 days |  | 10 years 6 months |  |  |  |  |
Accident and Health [Member] | Life Insurance [Member] | Cigna's Life Insurance Business in Asian Markets |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  | $ 9,105 |  |  |  |  |  |  |
Acquisition |  |  |  | 11,441 |  |  |  |  |  |  |
Accident and Health [Member] | Life Insurance [Member] | Huatai Group [Member] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition |  | $ 145 |  |  |  |  |  |  |  |  |
Acquisition |  | 163 |  |  |  |  |  |  |  |  |
Accident and Health [Member] | Overseas General Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  |  |  |  |  |  |  |  |  | 773 |
Insurance, Other [Member] | Life Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance – beginning of period |  | 42 |  | 30 |  | $ 35 |  |  |  |  |
Beginning balance at original discount rate |  | 64 |  | 43 |  | 28 |  |  |  |  | 32
Effect of changes in cash flow assumptions |  |  |  | 2 |  | 0 |  |  |  |  | (1)
Effect of actual variances from expected experience |  |  |  | 0 |  | 0 |  |  |  |  | 0
Adjusted beginning of period balance |  | 45 |  | 28 |  | 31 |  |  |  |  |
Issuances |  | 9 |  | 6 |  | 6 |  |  |  |  |
Interest accrual |  | 2 |  | 1 |  | 0 |  |  |  |  |
Net premiums collected (1) |  | (23) | [1] | (15) | [2] | (5) | [3] |  |  |  |
Other (including foreign exchange) |  | (19) |  | 0 |  | (4) |  |  |  |  |
Ending balance at original discount rate |  |  |  | 45 |  | 28 |  |  |  |  |
Effect of changes in discount rate assumptions |  | 0 |  | (1) |  | 2 |  |  |  |  |
Balance – end of period |  | 64 |  | 42 |  | 30 |  |  |  |  |
Balance – beginning of period |  | 269 |  | 127 |  | 124 |  |  |  |  |
Beginning balance at original discount rate |  | 492 |  | 280 |  | 119 |  |  |  |  | 104
Effect of changes in cash flow assumptions |  |  |  | 4 |  | 15 |  |  |  |  | (1)
Effect of actual variances from expected experience |  |  |  | (1) |  | 0 |  |  |  |  | $ (1)
Adjusted beginning of period balance |  | 283 |  | 134 |  | 102 |  |  |  |  |
Issuances |  | 9 |  | 6 |  | 6 |  |  |  |  |
Interest accrual |  | 9 |  | 4 |  | 2 |  |  |  |  |
Benefits payments |  | (13) |  | (6) |  | 0 |  |  |  |  |
Other (including foreign exchange) |  | (29) |  | (7) |  | (9) |  |  |  |  |
Ending balance at original discount rate |  |  |  | 283 |  | 134 |  |  |  |  |
Effect of changes in discount rate assumptions |  | 3 |  | (11) |  | 8 |  |  |  |  |
Balance – end of period |  | 495 |  | 269 |  | 127 |  |  |  |  |
Net liability for future policy benefits |  | 431 |  | 227 |  | 97 |  |  |  |  |
Deferred profit liability |  | 17 |  | 11 |  | 4 |  |  |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  | 448 |  | 238 |  | 101 |  |  |  | $ 89 |
Less: Reinsurance recoverable on future policy benefits |  | 0 |  | 0 |  | 0 |  |  |  |  |
Net liability for future policy benefits, after reinsurance recoverable |  | $ 448 |  | $ 238 |  | $ 101 |  |  |  |  |
Weighted-average duration (years) |  | 15 years |  | 14 years |  | 26 years 3 months 18 days |  |  |  |  |
Insurance, Other [Member] | Life Insurance [Member] | Cigna's Life Insurance Business in Asian Markets |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  | $ 23 |  |  |  |  |  |  |
Acquisition |  |  |  | $ 135 |  |  |  |  |  |  |
Insurance, Other [Member] | Life Insurance [Member] | Huatai Group [Member] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition |  | $ 12 |  |  |  |  |  |  |  |  |
Acquisition |  | $ 233 |  |  |  |  |  |  |  |  |
[1] | Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected benefit.
[2] | Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected benefit
[3] | Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected benefit.
[4] | Other business principally comprises certain Overseas General Insurance accident and health (A&H) policies and certain Chubb Life Re business.

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