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Investments - Securities Lending and Repurchase Agreements (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Securities Lending Transactions:
Gross amount of securities on loan	$ 820	$ 922
Gross amount of associated liability for collateral received	840	945
Repurchase agreements:
Gross amount of recognized liabilities for repurchase agreements	72	174
Gross amount of collateral pledged related to repurchase agreements	73	176
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	64	0
Gross amount of associated liability for collateral received, securities	$ 3	$ 0

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Securities Loaned, Collateral, Obligation to Return

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- Definition

Securities Loaned, Collateral, Obligation to Return Securities

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- Definition

Securities Sold Under Agreements to Repurchase, Collateral, Obligation to Return

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Amount, before effects of master netting arrangements, of securities loaned to entities in exchange for collateral. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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-Section 55
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Fair value of securities pledged as collateral against securities sold under agreement to repurchase.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
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Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
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