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Future policy benefits (Undiscounted & discounted FPB) (Details) - Segment Life [Member] - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Discounted expected future benefit payments | $ 28,622 | $ 27,462 | $ 23,052 | $ 23,324
Term Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 4,358 |  | 4,041 |
Undiscounted expected future gross premiums | 7,291 |  | 6,452 |
Discounted expected future benefit payments | 2,299 | 2,254 | 2,440 | 2,321
Discounted expected future gross premiums | 3,909 |  | 3,773 |
Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 24,834 |  | 16,446 |
Undiscounted expected future gross premiums | 9,593 |  | 6,895 |
Discounted expected future benefit payments | 10,568 | 10,063 | 5,908 | 5,696
Discounted expected future gross premiums | 7,774 |  | 5,398 |
Accident and Health Insurance Product Line [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 26,475 |  | 23,186 |
Undiscounted expected future gross premiums | 39,002 |  | 33,809 |
Discounted expected future benefit payments | 15,225 | 14,650 | 14,436 | 15,038
Discounted expected future gross premiums | 22,975 |  | 20,766 |
Insurance, Other |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 901 |  | 342 |
Undiscounted expected future gross premiums | 94 |  | 97 |
Discounted expected future benefit payments | 530 | $ 495 | 268 | $ 269
Discounted expected future gross premiums | $ 83 |  | $ 87 |

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