Future Policy Benefits (Assumption Explanations) (Details) - Other Operating Segment - USD ($)	Dec. 31, 2024	Dec. 31, 2023
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	$ 12,800,000,000	$ 12,100,000,000
Changes In Cash Flow Assumptions	31,000,000,000	17,000,000,000
Future Policy Benefits Actual To Expected Increase Decrease	(184,000,000,000)	(82,000,000,000)
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	(1,200,000,000)	(458,000,000,000)
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	3,400,000,000	3,600,000,000
Changes In Cash Flow Assumptions	28,000,000,000	12,000,000,000
Future Policy Benefits Actual To Expected Increase Decrease	(2,000,000,000)	(9,000,000,000)
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	(152,000,000,000)	(245,000,000,000)
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	1,500,000,000	1,400,000,000
Changes In Cash Flow Assumptions	25,000,000,000	47,000,000,000
Future Policy Benefits Actual To Expected Increase Decrease	8,000,000,000	13,000,000,000
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	115,000,000,000	50,000,000,000
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	4,900,000,000	4,600,000,000
Changes In Cash Flow Assumptions	73,000,000,000	9,000,000,000
Future Policy Benefits Actual To Expected Increase Decrease	79,000,000,000	45,000,000,000
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	(343,000,000,000)	(34,000,000,000)
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	8,100,000,000	5,400,000,000
Changes In Cash Flow Assumptions	8,000,000	22,000,000,000
Future Policy Benefits Actual To Expected Increase Decrease	(6,000,000,000)	(8,000,000,000)
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	(237,000,000)	(173,000,000)
Insurance, Other [Member] | CANADA
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net Liability For Future Policy Benefits At Original Discount Rate	4,300,000	26,000,000
Changes In Cash Flow Assumptions	0	22,000,000
Future Policy Benefits Actual To Expected Increase Decrease	0	(8,000,000)
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	(189,000,000)	(2,000,000)
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	6,900,000,000	6,100,000,000
Changes In Cash Flow Assumptions	3,000,000	34,000,000,000
Future Policy Benefits Actual To Expected Increase Decrease	0	55,000,000,000
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	242,000,000	261,000,000
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	11,900,000,000	6,000,000,000
Changes In Cash Flow Assumptions	9,000,000	0
Future Policy Benefits Actual To Expected Increase Decrease	7,000,000,000	2,000,000,000
Increase Decrease Impact Of Updating Discount Rate Recognized In OCI	$ (814,000,000)	$ (312,000,000)