Future policy benefits (Premiums & interest) (Details) - Segment Life [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	$ 2,902	$ 2,240
Interest Accretion	172	142
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	337	322
Interest Accretion	9	6
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	1,008	475
Interest Accretion	96	71
Accident and Health Insurance Product Line [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	1,525	1,422
Interest Accretion	61	63
Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	32	21
Interest Accretion	$ 6	$ 2