Future Policy Benefits (Assumption Explanations) (Details) - Other Segments - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 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	$ 11,100	$ 10,700
Future Policy Benefits Actual To Expected Variance	(34)	(97)
Impact Of Updating Discount Rate Recognized In OCI	$ (307)	$ (3,939)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	0.1% increase	0.4% increase
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.3% increase	0.9% increase
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	2.8% increase	37.1% 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	$ 3,500	$ 3,400
Future Policy Benefits Actual To Expected Variance	0	(17)
Impact Of Updating Discount Rate Recognized In OCI	$ (184)	$ (1,418)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	4.4% increase	0.6% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	—	0.5% increase
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	5.5% increase	41.1% 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	$ 1,300	$ 1,200
Future Policy Benefits Actual To Expected Variance	7	11
Impact Of Updating Discount Rate Recognized In OCI	$ (73)	$ (242)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	6.6% increase	5.5% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.6% increase	0.9% increase
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	6.0% decrease	19.8% 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	$ 4,400	$ 4,000
Future Policy Benefits Actual To Expected Variance	(23)	(49)
Impact Of Updating Discount Rate Recognized In OCI	$ (30)	$ (745)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	2.1% increase	1.5% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.5% decrease	1.2% increase
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	0.7% increase	18.5% decrease
Changes In Cash Flow Assumptions		$ (23)
Change In Cash Flow Assumptions Increase Decrease		0.6% 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	5	21
Impact Of Updating Discount Rate Recognized In OCI	$ (37)	$ 711
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	0.7% increase	3.0% 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	0.9% increase	16.2% decrease
Insurance, Other | CANADA
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	$ 51,000	$ 58,000
Future Policy Benefits Actual To Expected Variance	7	7
Impact Of Updating Discount Rate Recognized In OCI	$ (1)	$ 13
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	3.8% decrease	9.4% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	13.2% decrease	10.9% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	2% increase	20.3% 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	$ 6,300	$ 5,500
Future Policy Benefits Actual To Expected Variance	(14)	(12)
Impact Of Updating Discount Rate Recognized In OCI	$ (259)	$ (1,087)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	13.2% increase	11.7% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	0.3% decrease	0.2% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	4.63% decrease	17.5% 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	$ 5,900	$ 4,800
Future Policy Benefits Actual To Expected Variance	(1)	0
Impact Of Updating Discount Rate Recognized In OCI	$ (169)	$ 231
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease	19.1% increase	4.1% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease	—	—
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease	2.7% increase	4.6% decrease