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Derivative Instruments (Open Credit Default Swap Liabilities) (Details) - Credit Default Swap, Seller [Member] $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
Summary Of Credit Derivatives |  |
Maximum potential payout | $ 59 | $ 55
BBB+ [Member] |  |
Summary Of Credit Derivatives |  |
Maturity | Jun. 20, 2025 | Dec. 20, 2024
Credit rating of underlying obligation | BBB+ | BBB+
Number of instruments | security | 1 | 1
Fair value | $ 1 | $ 1
Maximum potential payout | $ 59 | $ 55

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- Definition Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch). + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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