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Derivative Financial Instruments and Off-balance sheet Financial Instruments - CDS notional amounts by credit rating (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) entity | Dec. 31, 2017 USD ($)
Derivative Financial Instruments and Off-balance sheet Financial Instruments |  |
Term of credit default swaps | 5 years |
Credit Derivatives |  |
Notional amount | $ 3,145 | $ 3,388
The number of reference entities generally included in a CDX index | entity | 125 |
Credit default contracts |  |
Credit Derivatives |  |
Notional amount | $ 5 | 105
Fair value | 0 | 1
Credit default contracts | Single name | Corporate |  |
Credit Derivatives |  |
Notional amount | 5 | 25
Fair value | 0 | 0
Credit default contracts | Index | Corporate |  |
Credit Derivatives |  |
Notional amount |  | 80
Fair value |  | 1
AA | Credit default contracts |  |
Credit Derivatives |  |
Notional amount | 0 | 1
AA | Credit default contracts | Single name | Corporate |  |
Credit Derivatives |  |
Notional amount | 0 | 0
AA | Credit default contracts | Index | Corporate |  |
Credit Derivatives |  |
Notional amount |  | 1
A | Credit default contracts |  |
Credit Derivatives |  |
Notional amount | 0 | 29
A | Credit default contracts | Single name | Corporate |  |
Credit Derivatives |  |
Notional amount | 0 | 10
A | Credit default contracts | Index | Corporate |  |
Credit Derivatives |  |
Notional amount |  | 19
BBB | Credit default contracts |  |
Credit Derivatives |  |
Notional amount | 0 | 55
BBB | Credit default contracts | Single name | Corporate |  |
Credit Derivatives |  |
Notional amount | 0 | 10
BBB | Credit default contracts | Index | Corporate |  |
Credit Derivatives |  |
Notional amount |  | 45
BB and lower | Credit default contracts |  |
Credit Derivatives |  |
Notional amount | 5 | 20
BB and lower | Credit default contracts | Single name | Corporate |  |
Credit Derivatives |  |
Notional amount | $ 5 | 5
BB and lower | Credit default contracts | Index | Corporate |  |
Credit Derivatives |  |
Notional amount |  | $ 15

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + 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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- Definition Fair value of credit risk derivative asset after deduction of credit risk derivative liability. + 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 (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5708775-113959 + Details
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