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Future policy benefits (Premiums & interest) (Details) - Segment Life [Member] - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums or Assessments | $ 1,470 | $ 1,140
Interest Accretion | 86 | 71
Term Life Insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums or Assessments | 167 | 160
Interest Accretion | 5 | 4
Whole Life Insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums or Assessments | 530 | 230
Interest Accretion | 47 | 34
Accident and Health Insurance Product Line [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums or Assessments | 753 | 733
Interest Accretion | 31 | 31
Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums or Assessments | 20 | 17
Interest Accretion | $ 3 | $ 2

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