Investments (Allowance for Credit Losses) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	$ 224	$ 240	$ 235	$ 121
Cumulative effect of adoption of ASU 2016-13				115
Addition to (release of) allowance for expected losses	(52)	5	(62)	6
Other	0	0	(1)	3
Balance, ending of year	172	245	172	245
Commercial Mortgage Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	209	225	218	114
Cumulative effect of adoption of ASU 2016-13				110
Addition to (release of) allowance for expected losses	(49)	5	(58)	6
Other	0	0	0	0
Balance, ending of year	160	230	160	230
Agricultural Property Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	8	8	9	3
Cumulative effect of adoption of ASU 2016-13				5
Addition to (release of) allowance for expected losses	(2)	0	(3)	0
Other	0	0	0	0
Balance, ending of year	6	8	6	8
Residential Property Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	0	0	0	0
Cumulative effect of adoption of ASU 2016-13				0
Addition to (release of) allowance for expected losses	0	0	0	0
Other	0	0	0	0
Balance, ending of year	0	0	0	0
Other Collateralized Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	2	3	3	0
Cumulative effect of adoption of ASU 2016-13				0
Addition to (release of) allowance for expected losses	0	0	0	0
Other	0	0	(1)	3
Balance, ending of year	2	3	2	3
Uncollateralized Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	5	4	5	4
Cumulative effect of adoption of ASU 2016-13				0
Addition to (release of) allowance for expected losses	(1)	0	(1)	0
Other	0	0	0	0
Balance, ending of year	$ 4	$ 4	$ 4	$ 4

Cumulative effect of adoption of ASU 2016-13 (Commercial mortgage and other loans)

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- Definition

Amount of other addition (reduction) in allowance reserve for credit loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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- Definition

Amount of increase (decrease) of allowance reserve for credit loss.

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(2))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 45
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-Publisher SEC
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-Number 229
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