Investments (Allowance for Credit Losses) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	$ 235	$ 121
Addition to (release of) allowance for credit/expected losses	(10)	1
Cumulative effect of adoption of ASU 2016-13		115
Other	(1)	3
Total ending balance	224	240
Commercial Mortgage Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	218	114
Addition to (release of) allowance for credit/expected losses	(9)	1
Cumulative effect of adoption of ASU 2016-13		110
Other	0	0
Total ending balance	209	225
Agricultural Property Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	9	3
Addition to (release of) allowance for credit/expected losses	(1)	0
Cumulative effect of adoption of ASU 2016-13		5
Other	0	0
Total ending balance	8	8
Residential Property Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	0	0
Addition to (release of) allowance for credit/expected losses	0	0
Cumulative effect of adoption of ASU 2016-13		0
Other	0	0
Total ending balance	0	0
Other Collateralized Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	3	0
Addition to (release of) allowance for credit/expected losses	0	0
Cumulative effect of adoption of ASU 2016-13		0
Other	(1)	3
Total ending balance	2	3
Uncollateralized Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	5	4
Addition to (release of) allowance for credit/expected losses	0	0
Cumulative effect of adoption of ASU 2016-13		0
Other	0	0
Total ending balance	$ 5	$ 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
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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
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-SubTopic 10
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-Paragraph 11B
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03(7)(2))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Name Accounting Standards Codification
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