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Derivative Instruments (Collateral Support Agreements) (Details) - Open Credit Default Swap Liabilities [Member] - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Credit risk related contingent features collateral |  |
Maximum potential payout | $ 56 | $ 40
Less: Counterparty thresholds |  |
Maximum collateral potentially required to post | $ 56 | $ 40

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- Definition Represents the maximum potential amount of future payments (undiscounted) the seller could be required to make under the credit derivative or each group of similar credit derivatives before reduction for potential recoveries under recourse or collateralization provisions in the credit derivative, net of any counterparty thresholds + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition The amount of unsecured credit exposure that exists at any given time, representing the amount from zero to a pre-determined limit (which varies by counterparty) at which collateral is required to by posted. + References No definition available. + Details
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Balance Type: | debit
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- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5708775-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Credit Derivative -URI http://asc.fasb.org/extlink&oid=6854095 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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