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Investments Investments (Rollforward of Allowance For Credit Losses) (Details) - Available-for-sale Securities [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 17	$ 19	$ 20	$ 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	10	40
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	(10)	(21)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	(3)
Corporate Debt Securities [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	12	19	17	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	5	38
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	(8)	(19)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	(2)
Debt Security, Government, Non-US [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	4	0	0	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	4	2
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	0	(2)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	0
Commercial Mortgage Backed Securities [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	1	0	$ 3	$ 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	1	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	(2)	$ 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	$ (1)

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-Subparagraph (e)
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+ References

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-Publisher FASB
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-Topic 320
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The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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