Future Policy Benefits (Assumption Explanations) (Details) - Other Segments - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
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	$ 11,000	$ 10,400
Future Policy Benefits Actual To Expected Variance	(24)	(105)
Impact Of Updating Discount Rate Recognized In OCI	$ (490)	$ (2,088)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	1.1% decrease	1.8% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.2% increase	1.0% increase
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	4.4% increase	19.6% decrease
Life Insurance Product Line [Member] | CANADA
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	$ 3,400	$ 3,500
Future Policy Benefits Actual To Expected Variance	(1)	(8)
Impact Of Updating Discount Rate Recognized In OCI	$ (143)	$ (792)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	1.1% increase	1.4% increase
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.0% increase	0.2% increase
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	4.3% increase	22.9% 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	$ 1,200	$ 1,200
Future Policy Benefits Actual To Expected Variance	(2)	(2)
Impact Of Updating Discount Rate Recognized In OCI	$ (2)	$ (128)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	3.0% increase	2.7% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.2% decrease	0.2% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	0.2% decrease	10.5% 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	$ 4,300	$ 4,000
Future Policy Benefits Actual To Expected Variance	(7)	(3)
Impact Of Updating Discount Rate Recognized In OCI	$ (46)	$ (369)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	1.2% increase	0.9% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.2% decrease	0.1% increase
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	1.1% increase	9.2% decrease
Insurance, Other | Americas [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	$ 4,200	$ 4,300
Future Policy Benefits Actual To Expected Variance	4	20
Impact Of Updating Discount Rate Recognized In OCI	$ (96)	$ 404
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	1.9% increase	1.8% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.1% decrease	0.5% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	2.3% increase	9.2% decrease
Insurance, Other | CANADA
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	$ 100	$ 100
Future Policy Benefits Actual To Expected Variance	4	5
Impact Of Updating Discount Rate Recognized In OCI	$ (3)	$ 8
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	5.7% decrease	3.1% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	7.5% decrease	7.8% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	5.7% increase	12.5% decrease
Insurance, Other | EMEA [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	$ 5,600	$ 6,000
Future Policy Benefits Actual To Expected Variance	(11)	(8)
Impact Of Updating Discount Rate Recognized In OCI	$ 46	$ (613)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	0.8% increase	3.9% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.2% decrease	0.1% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	0.8% increase	9.9% decrease
Insurance, Other | Asia Pacific [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	$ 6,100	$ 5,300
Future Policy Benefits Actual To Expected Variance	(1)	1
Impact Of Updating Discount Rate Recognized In OCI	$ (136)	$ 139
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	24.1% increase	6.1% increase
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.0% decrease	0.0% increase
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	2.7% increase	2.8% decrease