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Future policy benefits (Undiscounted & discounted FPB) (Details) - Segment Life [Member] - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Discounted expected future benefit payments | $ 33,355 | $ 30,635 | $ 31,056 | $ 27,462
Term Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 4,498 |  | 4,188 |
Undiscounted expected future gross premiums | 6,844 |  | 6,669 |
Discounted expected future benefit payments | 2,345 | 2,238 | 2,309 | 2,254
Discounted expected future gross premiums | 4,609 |  | 4,504 |
Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 32,059 |  | 28,111 |
Undiscounted expected future gross premiums | 11,115 |  | 10,363 |
Discounted expected future benefit payments | 13,702 | 12,057 | 11,909 | 10,063
Discounted expected future gross premiums | 9,180 |  | 8,404 |
Accident and Health Insurance Product Line [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 27,189 |  | 27,423 |
Undiscounted expected future gross premiums | 40,031 |  | 40,183 |
Discounted expected future benefit payments | 16,259 | 15,693 | 16,219 | 14,650
Discounted expected future gross premiums | 24,049 |  | 23,655 |
Insurance, Other |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 1,900 |  | 1,046 |
Undiscounted expected future gross premiums | 606 |  | 200 |
Discounted expected future benefit payments | 1,049 | $ 647 | 619 | $ 495
Discounted expected future gross premiums | $ 567 |  | $ 177 |

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