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Future policy benefits (Undiscounted & discounted FPB) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Discounted expected future benefit payments | $ 22,067 | $ 21,920 | $ 9,045 | $ 10,775
Term Life Insurance | Segment Life [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 2,381 |  | 1,266 |
Undiscounted expected future gross premiums | 2,701 |  | 1,382 |
Discounted expected future benefit payments | 1,531 | 1,427 | 788 | 921
Discounted expected future gross premiums | 1,805 |  | 1,045 |
Whole Life Insurance | Segment Life [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 16,890 |  | 9,799 |
Undiscounted expected future gross premiums | 6,971 |  | 3,457 |
Discounted expected future benefit payments | 6,678 | 6,048 | 3,871 | 4,785
Discounted expected future gross premiums | 5,455 |  | 2,499 |
Accident and Health Insurance Product Line [Member] | Segment Life [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 22,461 |  | 5,903 |
Undiscounted expected future gross premiums | 33,371 |  | 8,752 |
Discounted expected future benefit payments | 13,603 | 14,206 | 4,257 | 4,939
Discounted expected future gross premiums | 20,339 |  | 5,683 |
Insurance, Other | Segment Life [Member] |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 374 |  | 216 |
Undiscounted expected future gross premiums | 94 |  | 72 |
Discounted expected future benefit payments | 255 | $ 239 | 129 | $ 130
Discounted expected future gross premiums | $ 84 |  | $ 64 |

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