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Level 4~Investments - Securities Lending and Repurchase Agreements (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Investments [Abstract] |  |
Securities Loaned, Collateral, Obligation to Return Securities | $ 0 | $ 0
Securities Lending Transactions: |  |
Gross amount of securities on loan | 741 | 922
Gross amount of associated liability for collateral received | 755 | 945
Repurchase agreements: |  |
Gross amount of recognized liabilities for repurchase agreements | 171 | 174
Gross amount of collateral pledged related to repurchase agreements | $ 174 | $ 176

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- Definition Securities Loaned, Collateral, Obligation to Return Securities + References No definition available. + Details
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- Definition Securities Sold Under Agreements to Repurchase, Collateral, Obligation to Return + References No definition available. + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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