Future Policy Benefits (Premiums and Interest) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	$ 1,016	$ 962
Liability for Future Policy Benefit, Gross Premium Income	9,993	8,826
Americas [Member] | Life Insurance Product Line [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	404	383
Liability for Future Policy Benefit, Gross Premium Income	4,435	4,363
Americas [Member] | Insurance, Other | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	136	135
Liability for Future Policy Benefit, Gross Premium Income	979	21
CANADA | Life Insurance Product Line [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	158	164
Liability for Future Policy Benefit, Gross Premium Income	808	817
CANADA | Insurance, Other | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	1	2
Liability for Future Policy Benefit, Gross Premium Income	68	72
EMEA [Member] | Life Insurance Product Line [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	29	23
Liability for Future Policy Benefit, Gross Premium Income	1,058	1,033
EMEA [Member] | Insurance, Other | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	129	119
Liability for Future Policy Benefit, Gross Premium Income	515	468
Asia Pacific [Member] | Life Insurance Product Line [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	113	103
Liability for Future Policy Benefit, Gross Premium Income	1,959	1,880
Asia Pacific [Member] | Insurance, Other | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	46	33
Liability for Future Policy Benefit, Gross Premium Income	$ 171	$ 172