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Investments (Exposure To Concentrations Of Credit Risk) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Document Period End Date	Sep. 30, 2021
Available for Sale at Fair value - Amortized cost	$ 54,347	$ 49,548
Fixed maturity securities, available-for-sale	59,289	56,735
Government Of Japan [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	3,261	1,493
Fixed maturity securities, available-for-sale	3,252	1,491
Canadian Province Of Quebec Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	1,099	1,054
Fixed maturity securities, available-for-sale	1,445	1,528
Canadian Province Of Ontario Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	1,361	1,303
Fixed maturity securities, available-for-sale	$ 2,213	$ 2,474

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For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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