Future policy benefits (Premiums & interest) (Details) - Segment Life [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	$ 3,241	$ 2,902
Interest Accretion	202	172
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	353	337
Interest Accretion	10	9
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	1,250	1,008
Interest Accretion	120	96
Accident and Health Insurance Product Line [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	1,509	1,525
Interest Accretion	65	61
Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	129	32
Interest Accretion	$ 7	$ 6