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Future policy benefits (Undiscounted & discounted FPB) (Details) - Life Insurance [Member] - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Discounted expected future benefit payments | $ 27,462 | $ 23,324 | $ 10,387 | $ 11,100
Term Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 4,073 | 3,914 | 1,163 |
Undiscounted expected future gross premiums | 7,075 | 6,823 | 1,334 |
Discounted expected future benefit payments | 2,254 | 2,321 | 832 | 739
Discounted expected future gross premiums | 4,703 | 4,555 | 1,041 |
Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 23,990 | 16,224 | 9,898 |
Undiscounted expected future gross premiums | 9,469 | 6,912 | 3,583 |
Discounted expected future benefit payments | 10,063 | 5,696 | 4,493 | 4,886
Discounted expected future gross premiums | 7,658 | 5,398 | 2,656 |
Accident and Health [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 25,118 | 25,617 | 6,271 |
Undiscounted expected future gross premiums | 36,869 | 37,765 | 9,029 |
Discounted expected future benefit payments | 14,650 | 15,038 | 4,935 | 5,351
Discounted expected future gross premiums | 22,150 | 22,111 | 6,457 |
Insurance, Other [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 862 | 407 | 114 |
Undiscounted expected future gross premiums | 115 | 115 | 45 |
Discounted expected future benefit payments | 495 | 269 | 127 | $ 124
Discounted expected future gross premiums | $ 103 | $ 100 | $ 38 |

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