Future Policy Benefits (Assumption Explanations) (Details) - Other Segments - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Life Insurance Product Line [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Changes In Cash Flow Assumptions	$ 85,000,000	$ 222,000,000
Life Insurance Product Line [Member] | Americas [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	12,100,000,000	11,100,000,000
Changes In Cash Flow Assumptions	17,000,000	130,000,000
Future Policy Benefits Actual To Expected Increase Decrease	(82,000,000)	(88,000,000)
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	$ (458,000,000)	$ 5,000,000
Change In Cash Flow Assumptions Increase Decrease	0.2% increase	1.2% increase
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.7% increase	0.8% increase
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	4.1% increase	47.2% decrease
Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	$ 3,600,000,000	$ 3,300,000,000
Changes In Cash Flow Assumptions	12,000,000	2,000,000
Future Policy Benefits Actual To Expected Increase Decrease	(9,000,000)	0
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	$ (245,000,000)	$ 1,500,000,000
Change In Cash Flow Assumptions Increase Decrease	0.4% increase	0.1% increase
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.3% increase	None
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	7.4% increase	42.8% decrease
Life Insurance Product Line [Member] | EMEA [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	$ 1,400,000,000	$ 1,200,000,000
Changes In Cash Flow Assumptions	47,000,000	13,000,000
Future Policy Benefits Actual To Expected Increase Decrease	13,000,000	(22,000,000)
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	$ (50,000,000)	$ (334,000,000)
Change In Cash Flow Assumptions Increase Decrease	3.9% increase	1.1% increase
Future Policy Benefits Actual To Expected Variance Increase Decrease	1.1% increase	1.8% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	4.1% decrease	27.3% decrease
Life Insurance Product Line [Member] | Asia Pacific [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	$ 4,600,000,000	$ 4,300,000,000
Changes In Cash Flow Assumptions	9,000,000	77,000,000
Future Policy Benefits Actual To Expected Increase Decrease	(45,000,000)	37,000,000
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	$ 34,000,000	$ 914,000,000
Change In Cash Flow Assumptions Increase Decrease	0.2% increase	1.9% increase
Future Policy Benefits Actual To Expected Variance Increase Decrease	1.1% decrease	0.9% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	0.8% decrease	22.7% decrease
Insurance, Other [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Changes In Cash Flow Assumptions	$ 78,000,000	$ 17,000,000
Insurance, Other [Member] | Americas [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	5,400,000,000	4,200,000,000
Changes In Cash Flow Assumptions	(22,000,000)	(3,000,000)
Future Policy Benefits Actual To Expected Increase Decrease	8,000,000	24,000,000
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	$ (173,000,000)	$ 880,000,000
Change In Cash Flow Assumptions Increase Decrease	0.5% decrease	0.1% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.2% decrease	0.5% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	4.2% increase	20.0% decrease
Insurance, Other [Member] | Canada Segment Reporting Information [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	$ 26,000,000	$ 53,000,000
Changes In Cash Flow Assumptions	(22,000,000)	0
Future Policy Benefits Actual To Expected Increase Decrease	8,000,000	12,000,000
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	$ (2,000,000)	$ 16,000,000
Change In Cash Flow Assumptions Increase Decrease	41.5% decrease	None
Future Policy Benefits Actual To Expected Variance Increase Decrease	15.1% decrease	18.8% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	3.8% increase	25.0% decrease
Insurance, Other [Member] | EMEA [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	$ 6,100,000,000	$ 5,500,000,000
Changes In Cash Flow Assumptions	(34,000,000)	(14,000,000)
Future Policy Benefits Actual To Expected Increase Decrease	(55,000,000)	(7,000,000)
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	$ 261,000,000	$ (1,400,000)
Change In Cash Flow Assumptions Increase Decrease	0.6% decrease	0.2% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	1.0% decrease	0.1% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	4.7% increase	28.4% decrease
Insurance, Other [Member] | Asia Pacific [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	$ 6,000,000,000	$ 5,000,000,000
Changes In Cash Flow Assumptions	0	0
Future Policy Benefits Actual To Expected Increase Decrease	(2,000,000)	7,000,000
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	$ 312,000,000	$ 463,000,000
Change In Cash Flow Assumptions Increase Decrease	None	None
Future Policy Benefits Actual To Expected Variance Increase Decrease	None	0.1% increase
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	6.3% decrease	10.3% decrease