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Future policy benefits (Undiscounted & discounted FPB) (Details) - Segment Life [Member] - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Discounted expected future benefit payments | $ 33,524 | $ 30,635 | $ 28,536 | $ 27,462
Term Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 4,563 |  | 4,334 |
Undiscounted expected future gross premiums | 7,094 |  | 7,223 |
Discounted expected future benefit payments | 2,344 | 2,238 | 2,264 | 2,254
Discounted expected future gross premiums | 4,775 |  | 4,776 |
Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 30,751 |  | 25,052 |
Undiscounted expected future gross premiums | 10,841 |  | 9,555 |
Discounted expected future benefit payments | 13,407 | 12,057 | 10,659 | 10,063
Discounted expected future gross premiums | 8,929 |  | 7,744 |
Accident and Health Insurance Product Line [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 28,274 |  | 26,037 |
Undiscounted expected future gross premiums | 41,427 |  | 38,166 |
Discounted expected future benefit payments | 16,781 | 15,693 | 15,058 | 14,650
Discounted expected future gross premiums | 24,697 |  | 22,556 |
Insurance, Other |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 1,754 |  | 956 |
Undiscounted expected future gross premiums | 570 |  | 174 |
Discounted expected future benefit payments | 992 | $ 647 | 555 | $ 495
Discounted expected future gross premiums | $ 527 |  | $ 155 |

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