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Reinsurance (Reinsurance Amounts Recorded on Consolidated Statements of Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reinsurance [Abstract]
Direct insurance premiums and fee income	$ 13,304	$ 13,498	$ 12,041
Reinsurance assumed	95	91	89
Reinsurance ceded	(1,656)	(1,579)	(1,543)
Total insurance premiums and fee income	11,743	12,010	10,587
Direct insurance benefits	10,630	9,574	8,592
Reinsurance recoveries netted against benefits	(1,953)	(1,694)	(1,806)
Benefits	$ 8,677	$ 7,880	$ 6,786

X

- Definition

Amount of written premiums assumed from other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
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X

- Definition

Amount of written premiums ceded to other entities.

+ References

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- Definition

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+ References

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- Definition

Amount, before effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred.

+ References

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Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.

+ References

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+ References

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-Publisher FASB
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