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Future policy benefits (Undiscounted & discounted FPB) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
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Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Discounted expected future benefit payments | $ 25,526 | $ 21,920 | $ 20,813 | $ 10,775
Term Life Insurance | Segment Life [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 2,492 |  | 2,189 |
Undiscounted expected future gross premiums | 2,884 |  | 2,503 |
Discounted expected future benefit payments | 1,558 | 1,427 | 1,321 | 921
Discounted expected future gross premiums | 1,910 |  | 1,682 |
Whole Life Insurance | Segment Life [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 23,457 |  | 15,631 |
Undiscounted expected future gross premiums | 9,478 |  | 6,654 |
Discounted expected future benefit payments | 9,928 | 6,048 | 5,723 | 4,785
Discounted expected future gross premiums | 7,654 |  | 5,173 |
Accident and Health Insurance Product Line [Member] | Segment Life [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 23,168 |  | 23,873 |
Undiscounted expected future gross premiums | 34,055 |  | 34,659 |
Discounted expected future benefit payments | 13,319 | 14,206 | 13,644 | 4,939
Discounted expected future gross premiums | 20,604 |  | 20,193 |
Insurance, Other | Segment Life [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 977 |  | 265 |
Undiscounted expected future gross premiums | 103 |  | 102 |
Discounted expected future benefit payments | 721 | $ 239 | 125 | $ 130
Discounted expected future gross premiums | $ 92 |  | $ 92 |

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