Future policy benefits (Premiums & interest) (Details) - Life Insurance [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	$ 5,729	$ 4,846	$ 3,015
Interest Accretion	361	332	228
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	684	641	472
Interest Accretion	18	19	12
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	1,962	1,259	651
Interest Accretion	203	165	121
Accident and Health [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	3,016	2,918	1,875
Interest Accretion	128	141	92
Insurance, Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	67	28	17
Interest Accretion	$ 12	$ 7	$ 3