Average debt service coverage ratio.

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- Definition

Amount of financing receivable originated five or more years prior to latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447

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- Definition

Amount of financing receivable originated four years prior to latest fiscal year.

+ References

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- Definition

Amount of financing receivable originated in current fiscal year.

+ References

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- Definition

Amount of financing receivable originated in fiscal year prior to latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447

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-Publisher FASB
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-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448

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- Definition

Amount of financing receivable originated three years prior to latest fiscal year.

+ References

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- Definition

Amount of financing receivable originated two years prior to latest fiscal year.

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- Definition

Amount, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details) $ in Millions	Mar. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Schedule of Investments [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 4,215	$ 4,215
Commercial Loan [Member]
Schedule of Investments [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 4,374		$ 4,215
Avg. Debt-Service Coverage Ratio	2.48		2.46
Commercial Loan [Member] \| 65% - 80%
Schedule of Investments [Line Items]
Financing Receivable, before Allowance for Credit Loss			$ 376
Avg. Debt-Service Coverage Ratio	1.57		1.53
Commercial Loan [Member] \| Less than 65%
Schedule of Investments [Line Items]
Financing Receivable, before Allowance for Credit Loss			$ 3,839
Avg. Debt-Service Coverage Ratio	2.56		2.56
Amortized Cost [Member] \| Commercial Loan [Member]
Schedule of Investments [Line Items]
Mortgage loans originated in current year	$ 202
Mortgage loans originated in year before latest fiscal year	988
Mortgage loans originated two years before latest fiscal year	698
Mortgage loans originated three years before latest fiscal year	510
Mortgage loans originated four years before latest fiscal year	288
Mortgage loans originated five or more years before latest fiscal year	1,688
Financing Receivable, before Allowance for Credit Loss	4,374		$ 4,200
Amortized Cost [Member] \| Commercial Loan [Member] \| 65% - 80%
Schedule of Investments [Line Items]
Mortgage loans originated in current year	0
Mortgage loans originated in year before latest fiscal year	90
Mortgage loans originated two years before latest fiscal year	175
Mortgage loans originated three years before latest fiscal year	48
Mortgage loans originated four years before latest fiscal year	33
Mortgage loans originated five or more years before latest fiscal year	16
Financing Receivable, before Allowance for Credit Loss	362
Amortized Cost [Member] \| Commercial Loan [Member] \| Less than 65%
Schedule of Investments [Line Items]
Mortgage loans originated in current year	202
Mortgage loans originated in year before latest fiscal year	898
Mortgage loans originated two years before latest fiscal year	523
Mortgage loans originated three years before latest fiscal year	462
Mortgage loans originated four years before latest fiscal year	255
Mortgage loans originated five or more years before latest fiscal year	1,672
Financing Receivable, before Allowance for Credit Loss	$ 4,012
2020 \| Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.51
2020 \| Commercial Loan [Member] \| 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	0
2020 \| Commercial Loan [Member] \| Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.51
2019 \| Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.43
2019 \| Commercial Loan [Member] \| 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.48
2019 \| Commercial Loan [Member] \| Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.52
2018 \| Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.96
2018 \| Commercial Loan [Member] \| 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.80
2018 \| Commercial Loan [Member] \| Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.01
2017 \| Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.91
2017 \| Commercial Loan [Member] \| 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.06
2017 \| Commercial Loan [Member] \| Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.00
2016 \| Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.66
2016 \| Commercial Loan [Member] \| 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.35
2016 \| Commercial Loan [Member] \| Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.83
2015 & prior \| Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.86
2015 & prior \| Commercial Loan [Member] \| 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.52
2015 & prior \| Commercial Loan [Member] \| Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.87