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Future policy benefits (Premiums & interest) (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums or Assessments | $ 3,035 | $ 1,717
Interest Accretion | 141 | 85
Term Life Insurance | Segment Life [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums or Assessments | 339 | 172
Interest Accretion | 6 | 4
Whole Life Insurance | Segment Life [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums or Assessments | 487 | 173
Interest Accretion | 70 | 53
Accident and Health Insurance Product Line [Member] | Segment Life [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums or Assessments | 1,409 | 533
Interest Accretion | 63 | 28
Accident and Health Insurance Product Line [Member] | Overseas General Insurance [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums or Assessments | 768 | 705
Interest Accretion | 0 | 0
Insurance, Other | Segment Life [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums or Assessments | 32 | 134
Interest Accretion | $ 2 | $ 0

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