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Future policy benefits (Premiums & interest) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums or Assessments | $ 4,846 | $ 3,015 | $ 1,843
Interest Accretion | 332 | 228 | 168
Term Life Insurance | Life Insurance [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums or Assessments | 641 | 472 | 375
Interest Accretion | 19 | 12 | 8
Whole Life Insurance | Life Insurance [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums or Assessments | 1,259 | 651 | 390
Interest Accretion | 165 | 121 | 101
Accident and Health [Member] | Life Insurance [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums or Assessments | 2,918 | 1,875 | 1,068
Interest Accretion | 141 | 92 | 57
Insurance, Other [Member] | Life Insurance [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums or Assessments | 28 | 17 | 10
Interest Accretion | $ 7 | $ 3 | $ 2

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