Deferred Policy Acquisition Costs (Movement Analysis Of Deferred Policy Acquisition Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	$ 5,543	$ 4,617
Deferred Policy Acquisition Costs, Amortization Expense	(1,641)	(1,397)	$ (1,344)
Corporate And Other Segment Reporting Information [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	18	6
Life Insurance Product Line [Member] | Americas [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	2,986
Life Insurance Product Line [Member] | Americas [Member] | Other Operating Segment
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs		2,191	2,087
Deferred Policy Acquisition Cost, Capitalization	970	248
Deferred Policy Acquisition Costs, Amortization Expense	(174)	(145)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment	(1)	1
Life Insurance Product Line [Member] | CANADA
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	157
Life Insurance Product Line [Member] | CANADA | Other Operating Segment
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs		173	171
Deferred Policy Acquisition Cost, Capitalization	9	9
Deferred Policy Acquisition Costs, Amortization Expense	(11)	(12)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment	(14)	5
Life Insurance Product Line [Member] | EMEA [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	354
Life Insurance Product Line [Member] | EMEA [Member] | Other Operating Segment
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs		347	294
Deferred Policy Acquisition Cost, Capitalization	70	100
Deferred Policy Acquisition Costs, Amortization Expense	(49)	(50)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment	(14)	3
Life Insurance Product Line [Member] | Asia Pacific [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	1,178
Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Operating Segment
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs		1,098	1,043
Deferred Policy Acquisition Cost, Capitalization	167	121
Deferred Policy Acquisition Costs, Amortization Expense	(58)	(59)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment	(29)	(7)
Insurance, Other [Member] | Americas [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	506
Insurance, Other [Member] | Americas [Member] | Other Operating Segment
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs		552	341
Deferred Policy Acquisition Cost, Capitalization	6	259
Deferred Policy Acquisition Costs, Amortization Expense	(52)	(48)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment	0	0
Insurance, Other [Member] | CANADA
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	20
Insurance, Other [Member] | CANADA | Other Operating Segment
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs		0	0
Deferred Policy Acquisition Cost, Capitalization	21	0
Deferred Policy Acquisition Costs, Amortization Expense	0	0
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment	(1)	0
Insurance, Other [Member] | EMEA [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	0
Insurance, Other [Member] | EMEA [Member] | Other Operating Segment
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs		0	0
Deferred Policy Acquisition Cost, Capitalization	0	0
Deferred Policy Acquisition Costs, Amortization Expense	0	0
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment	0	0
Insurance, Other [Member] | Asia Pacific [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	324
Insurance, Other [Member] | Asia Pacific [Member] | Other Operating Segment
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs		250	$ 188
Deferred Policy Acquisition Cost, Capitalization	122	99
Deferred Policy Acquisition Costs, Amortization Expense	(45)	(33)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment	$ (3)	$ (4)