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Investments (Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 353	$ 342
Adoption of new credit loss guidance	78	0
Initial credit losses on PCD loans	16	0
Provision (release)	115	19
Charge-offs, net of recoveries	(7)	(4)
Balance, end of period	555	357
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	246	238
Adoption of new credit loss guidance	(118)	0
Initial credit losses on PCD loans	0	0
Provision (release)	47	8
Charge-offs, net of recoveries	0	0
Balance, end of period	175	246
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	55	58
Adoption of new credit loss guidance	161	0
Initial credit losses on PCD loans	16	0
Provision (release)	62	9
Charge-offs, net of recoveries	(5)	(4)
Balance, end of period	289	63
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	52	46
Adoption of new credit loss guidance	35	0
Initial credit losses on PCD loans	0	0
Provision (release)	6	2
Charge-offs, net of recoveries	(2)	0
Balance, end of period	$ 91	$ 48

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The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 4
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Amount, after recoveries, of loans and leases that have been written-off.

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Amount of credit loss expense (reversal of expense) for financing receivable from change in methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 11
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447

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Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 19
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919265-210447

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Amount of expense related to estimated loss from loan and lease transactions.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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