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Derivative Financial Instruments - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |  |  |
Cash flow hedge losses to be reclassified from AOCI during the next twelve months (less than) | $ 1,000,000 |  | $ 1,000,000 |  |
Net gain (loss) recognized in earnings during the reporting period representing the amount of the fair value of the hedges' ineffectiveness. | 0 | $ 0 | 0 | $ 0 |
Cash and securities pledged as collateral by counterparties | 9,000,000 |  | 9,000,000 |  |
Securities pledged as collateral to counterparties | 2,000,000 |  | 2,000,000 |  |
Collateral posted under MNAs for contracts containing credit-risk-contingent features | 1,000,000 |  | 1,000,000 |  | $ 6,000,000
Maximum amount of additional exposure for contracts with credit-risk-contingent features if all features were triggered concurrently | 1,000,000 |  | 1,000,000 |  |
Cash and securities pledged in the form of margin deposits | $ 32,000,000 |  | $ 32,000,000 |  |
Term of credit default swaps (in years) |  |  | 5 years |  |

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- Definition This element represents cash and securities pledged as collateral from counterparties. + References No definition available. + Details
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- Definition Collateral Already Posted, Aggregate Fair Value, Without Credit-Risk-Contingent Features + References No definition available. + Details
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- Definition This element represents securities pledged to counterparties as collateral for credit exposure. + References No definition available. + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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- Definition Term of the credit risk derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5708775-113959 + Details
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- References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Definition Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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- Definition The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer. + 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 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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