Future Policy Benefits (Premiums and Interest) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	$ 651	$ 642
Liability for Future Policy Benefit, Gross Premium Income	6,079	5,861
Americas [Member] | Life Insurance Product Line [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	262	250
Liability for Future Policy Benefit, Gross Premium Income	2,935	2,879
Americas [Member] | Insurance, Other | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	88	92
Liability for Future Policy Benefit, Gross Premium Income	166	15
CANADA | Life Insurance Product Line [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	104	110
Liability for Future Policy Benefit, Gross Premium Income	535	552
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	46	48
EMEA [Member] | Life Insurance Product Line [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	16	16
Liability for Future Policy Benefit, Gross Premium Income	697	708
EMEA [Member] | Insurance, Other | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	80	83
Liability for Future Policy Benefit, Gross Premium Income	335	319
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	73	66
Liability for Future Policy Benefit, Gross Premium Income	1,257	1,237
Asia Pacific [Member] | Insurance, Other | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	27	23
Liability for Future Policy Benefit, Gross Premium Income	$ 108	$ 103