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Future policy benefits (Undiscounted & discounted FPB) (Details) - Segment Life [Member] - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Discounted expected future benefit payments | $ 28,536 | $ 27,462 | $ 23,197 | $ 23,324
Term Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 4,334 |  | 4,085 |
Undiscounted expected future gross premiums | 7,223 |  | 6,543 |
Discounted expected future benefit payments | 2,264 | 2,254 | 2,538 | 2,321
Discounted expected future gross premiums | 4,776 |  | 3,779 |
Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 25,052 |  | 16,759 |
Undiscounted expected future gross premiums | 9,555 |  | 6,972 |
Discounted expected future benefit payments | 10,659 | 10,063 | 6,364 | 5,696
Discounted expected future gross premiums | 7,744 |  | 5,455 |
Accident and Health Insurance Product Line [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 26,037 |  | 23,661 |
Undiscounted expected future gross premiums | 38,166 |  | 34,381 |
Discounted expected future benefit payments | 15,058 | 14,650 | 14,038 | 15,038
Discounted expected future gross premiums | 22,556 |  | 21,019 |
Insurance, Other |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 956 |  | 346 |
Undiscounted expected future gross premiums | 174 |  | 94 |
Discounted expected future benefit payments | 555 | $ 495 | 257 | $ 269
Discounted expected future gross premiums | $ 155 |  | $ 84 |

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