Short-term Borrowings (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Borrowings
Amount of the liability including accrued interest	$ 200	$ 201
Federal Home Loan Bank [Member]
Borrowings
Amount of the liability including accrued interest	$ 200	$ 201
Remaining maturity of outstanding amount of short term borrowings	3 months	2 months
Weighted average annualized interest rate	1.40%	1.80%
Commercial mortgage backed securities [Member] \| Federal Home Loan Bank [Member]
Borrowings
Securities pledged as collateral	$ 930	$ 840

Remaining maturity of outstanding amount of short term borrowings

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- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
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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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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Weighted average interest rate of short-term debt outstanding calculated at point in time.

+ References

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