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Future policy benefits (Rollforward) (Details) - USD ($) $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |
Balance – beginning of period |  | $ 13,024 | $ 4,313 |  |  |
Beginning balance at original discount rate |  |  |  | $ 13,685 | $ 3,991 |
Effect of changes in cash flow assumptions |  |  |  | (734) | (32) |
Effect of actual variances from expected experience |  |  |  | (127) | (139) |
Adjusted beginning of period balance |  | 12,824 | 3,820 |  |  |
Consolidation of Huatai Group |  | 1,850 |  |  |  |
Acquisition of Cigna |  |  | 9,737 |  |  |
Issuances |  | 1,435 | 601 |  |  |
Interest accrual |  | 529 | 267 |  |  |
Net premiums collected (1) | [1] | (1,515) | (703) |  |  |
Other (including foreign exchange) |  | 259 | (639) |  |  |
Ending balance at original discount rate |  | 14,864 | 13,083 |  |  |
Effect of changes in discount rate assumptions |  | (629) | (686) |  |  |
Balance – end of period |  | 14,235 | 12,397 |  |  |
Balance – beginning of period |  | 21,920 | 10,775 |  |  |
Beginning balance at original discount rate |  |  |  | 23,052 | 9,402 |
Effect of changes in cash flow assumptions |  |  |  | (770) | (38) |
Effect of actual variances from expected experience |  |  |  | (112) | (144) |
Adjusted beginning of period balance |  | 22,170 | 9,220 |  |  |
Consolidation of Huatai Group |  | 4,137 |  |  |  |
Acquisition of Cigna |  |  | 13,583 |  |  |
Issuances |  | 1,436 | 606 |  |  |
Interest accrual |  | 750 | 420 |  |  |
Benefits payments |  | (1,404) | (704) |  |  |
Other (including foreign exchange) |  | (336) | 1,072 |  |  |
Ending balance at original discount rate |  | 26,753 | 22,053 |  |  |
Effect of changes in discount rate assumptions |  | (1,227) | (1,240) |  |  |
Balance – end of period |  | 25,526 | 20,813 |  |  |
Net liability for future policy benefits |  | 12,009 | 9,151 |  |  |
Deferred profit liability |  | 1,100 | 755 |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  | 13,109 | 9,906 | 10,476 |  | $ 7,652
Less: Reinsurance recoverable on future policy benefits |  | 315 | 312 |  |  |
Net liability for future policy benefits, after reinsurance recoverable |  | $ 12,794 | $ 9,594 |  |  |
Weighted-average duration (years) |  | 18 years 8 months 12 days | 16 years 2 months 12 days |  |  |
Term Life Insurance | Segment Life [Member] |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |
Balance – beginning of period |  | $ 818 | $ 422 |  |  |
Beginning balance at original discount rate |  |  |  | 879 | 397 |
Effect of changes in cash flow assumptions |  |  |  | 35 | 0 |
Effect of actual variances from expected experience |  |  |  | (13) | (31) |
Adjusted beginning of period balance |  | 901 | 366 |  |  |
Consolidation of Huatai Group |  | 3 |  |  |  |
Acquisition of Cigna |  |  | 445 |  |  |
Issuances |  | 90 | 95 |  |  |
Interest accrual |  | 45 | 45 |  |  |
Net premiums collected (1) | [1] | (127) | (93) |  |  |
Other (including foreign exchange) |  | 9 | (46) |  |  |
Ending balance at original discount rate |  | 903 | 812 |  |  |
Effect of changes in discount rate assumptions |  | (69) | (59) |  |  |
Balance – end of period |  | 834 | 753 |  |  |
Balance – beginning of period |  | 1,427 | 921 |  |  |
Beginning balance at original discount rate |  |  |  | 1,555 | 858 |
Effect of changes in cash flow assumptions |  |  |  | 31 | (5) |
Effect of actual variances from expected experience |  |  |  | (10) | (32) |
Adjusted beginning of period balance |  | 1,576 | 821 |  |  |
Consolidation of Huatai Group |  | 17 |  |  |  |
Acquisition of Cigna |  |  | 668 |  |  |
Issuances |  | 90 | 100 |  |  |
Interest accrual |  | 54 | 52 |  |  |
Benefits payments |  | (119) | (82) |  |  |
Other (including foreign exchange) |  | 92 | 112 |  |  |
Ending balance at original discount rate |  | 1,710 | 1,447 |  |  |
Effect of changes in discount rate assumptions |  | (152) | (126) |  |  |
Balance – end of period |  | 1,558 | 1,321 |  |  |
Net liability for future policy benefits |  | 724 | 568 |  |  |
Deferred profit liability |  | 223 | 172 |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  | 947 | 740 |  |  | 454
Less: Reinsurance recoverable on future policy benefits |  | 111 | 111 |  |  |
Net liability for future policy benefits, after reinsurance recoverable |  | $ 836 | $ 629 |  |  |
Weighted-average duration (years) |  | 10 years 2 months 12 days | 9 years |  |  |
Whole Life Insurance | Segment Life [Member] |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |
Balance – beginning of period |  | $ 2,301 | $ 1,341 |  |  |
Beginning balance at original discount rate |  |  |  | 2,354 | 1,243 |
Effect of changes in cash flow assumptions |  |  |  | 40 | (3) |
Effect of actual variances from expected experience |  |  |  | 6 | 12 |
Adjusted beginning of period balance |  | 2,400 | 1,252 |  |  |
Consolidation of Huatai Group |  | 1,690 |  |  |  |
Acquisition of Cigna |  |  | 1,078 |  |  |
Issuances |  | 274 | 155 |  |  |
Interest accrual |  | 62 | 37 |  |  |
Net premiums collected (1) | [1] | (375) | (156) |  |  |
Other (including foreign exchange) |  | 56 | (102) |  |  |
Ending balance at original discount rate |  | 3,995 | 2,264 |  |  |
Effect of changes in discount rate assumptions |  | (62) | (95) |  |  |
Balance – end of period |  | 3,933 | 2,169 |  |  |
Balance – beginning of period |  | 6,048 | 4,785 |  |  |
Beginning balance at original discount rate |  |  |  | 6,225 | 3,833 |
Effect of changes in cash flow assumptions |  |  |  | 44 | (3) |
Effect of actual variances from expected experience |  |  |  | 12 | 14 |
Adjusted beginning of period balance |  | 6,281 | 3,844 |  |  |
Consolidation of Huatai Group |  | 3,659 |  |  |  |
Acquisition of Cigna |  |  | 2,267 |  |  |
Issuances |  | 276 | 155 |  |  |
Interest accrual |  | 176 | 123 |  |  |
Benefits payments |  | (212) | (151) |  |  |
Other (including foreign exchange) |  | 22 | 207 |  |  |
Ending balance at original discount rate |  | 10,202 | 6,031 |  |  |
Effect of changes in discount rate assumptions |  | (274) | (308) |  |  |
Balance – end of period |  | 9,928 | 5,723 |  |  |
Net liability for future policy benefits |  | 5,995 | 3,554 |  |  |
Deferred profit liability |  | 707 | 450 |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  | 6,702 | 4,004 |  |  | 3,767
Less: Reinsurance recoverable on future policy benefits |  | 47 | 56 |  |  |
Net liability for future policy benefits, after reinsurance recoverable |  | $ 6,655 | $ 3,948 |  |  |
Weighted-average duration (years) |  | 26 years 6 months | 24 years 8 months 12 days |  |  |
Accident and Health Insurance Product Line [Member] | Segment Life [Member] |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |
Balance – beginning of period |  | $ 9,863 | $ 2,520 |  |  |
Beginning balance at original discount rate |  |  |  | 10,409 | 2,323 |
Effect of changes in cash flow assumptions |  |  |  | (811) | (29) |
Effect of actual variances from expected experience |  |  |  | (120) | (120) |
Adjusted beginning of period balance |  | 9,478 | 2,174 |  |  |
Consolidation of Huatai Group |  | 145 |  |  |  |
Acquisition of Cigna |  |  | 8,191 |  |  |
Issuances |  | 1,066 | 348 |  |  |
Interest accrual |  | 421 | 184 |  |  |
Net premiums collected (1) | [1] | (998) | (445) |  |  |
Other (including foreign exchange) |  | 212 | (487) |  |  |
Ending balance at original discount rate |  | 9,900 | 9,965 |  |  |
Effect of changes in discount rate assumptions |  | (497) | (531) |  |  |
Balance – end of period |  | 9,403 | 9,434 |  |  |
Balance – beginning of period |  | 14,206 | 4,939 |  |  |
Beginning balance at original discount rate |  |  |  | 15,022 | 4,589 |
Effect of changes in cash flow assumptions |  |  |  | (848) | (41) |
Effect of actual variances from expected experience |  |  |  | (114) | (126) |
Adjusted beginning of period balance |  | 14,060 | 4,422 |  |  |
Consolidation of Huatai Group |  | 163 |  |  |  |
Acquisition of Cigna |  |  | 10,542 |  |  |
Issuances |  | 1,065 | 348 |  |  |
Interest accrual |  | 514 | 242 |  |  |
Benefits payments |  | (1,065) | (469) |  |  |
Other (including foreign exchange) |  | (628) | 651 |  |  |
Ending balance at original discount rate |  | 14,109 | 14,434 |  |  |
Effect of changes in discount rate assumptions |  | (790) | (790) |  |  |
Balance – end of period |  | 13,319 | 13,644 |  |  |
Net liability for future policy benefits |  | 3,916 | 4,210 |  |  |
Deferred profit liability |  | 156 | 125 |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  | 4,072 | 4,335 |  |  | 2,569
Less: Reinsurance recoverable on future policy benefits |  | 103 | 107 |  |  |
Net liability for future policy benefits, after reinsurance recoverable |  | $ 3,969 | $ 4,228 |  |  |
Weighted-average duration (years) |  | 10 years 3 months 18 days | 11 years |  |  |
Accident and Health Insurance Product Line [Member] | Overseas General Insurance [Member] |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |
Net liability for future policy benefits |  | $ 718 | $ 735 |  |  |
Deferred profit liability |  | 0 | 0 |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  | 718 | 735 |  |  | 773
Less: Reinsurance recoverable on future policy benefits |  | 33 | 38 |  |  |
Net liability for future policy benefits, after reinsurance recoverable |  | $ 685 | $ 697 |  |  |
Weighted-average duration (years) |  | 4 years 10 months 24 days | 5 years 1 month 6 days |  |  |
Insurance, Other | Segment Life [Member] |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |
Balance – beginning of period |  | $ 42 | $ 30 |  |  |
Beginning balance at original discount rate |  |  |  | 43 | 28 |
Effect of changes in cash flow assumptions |  |  |  | 2 | 0 |
Effect of actual variances from expected experience |  |  |  | 0 | 0 |
Adjusted beginning of period balance |  | 45 | 28 |  |  |
Consolidation of Huatai Group |  | 12 |  |  |  |
Acquisition of Cigna |  |  | 23 |  |  |
Issuances |  | 5 | 3 |  |  |
Interest accrual |  | 1 | 1 |  |  |
Net premiums collected (1) | [1] | (15) | (9) |  |  |
Other (including foreign exchange) |  | (18) | (4) |  |  |
Ending balance at original discount rate |  | 66 | 42 |  |  |
Effect of changes in discount rate assumptions |  | (1) | (1) |  |  |
Balance – end of period |  | 65 | 41 |  |  |
Balance – beginning of period |  | 239 | 130 |  |  |
Beginning balance at original discount rate |  |  |  | 250 | 122 |
Effect of changes in cash flow assumptions |  |  |  | 3 | 11 |
Effect of actual variances from expected experience |  |  |  | $ 0 | $ 0 |
Adjusted beginning of period balance |  | 253 | 133 |  |  |
Consolidation of Huatai Group |  | 298 |  |  |  |
Acquisition of Cigna |  |  | 106 |  |  |
Issuances |  | 5 | 3 |  |  |
Interest accrual |  | 6 | 3 |  |  |
Benefits payments |  | (8) | (2) |  |  |
Other (including foreign exchange) |  | 178 | 102 |  |  |
Ending balance at original discount rate |  | 732 | 141 |  |  |
Effect of changes in discount rate assumptions |  | (11) | (16) |  |  |
Balance – end of period |  | 721 | 125 |  |  |
Net liability for future policy benefits |  | 656 | 84 |  |  |
Deferred profit liability |  | 14 | 8 |  |  |
Net liability for future policy benefits, per consolidated balance sheet |  | 670 | 92 |  |  | $ 89
Less: Reinsurance recoverable on future policy benefits |  | 21 | 0 |  |  |
Net liability for future policy benefits, after reinsurance recoverable |  | $ 649 | $ 92 |  |  |
Weighted-average duration (years) |  | 15 years 1 month 6 days | 13 years 6 months |  |  |
[1] | Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected benefit.

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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