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Derivative Financial Instruments - CDS notional amount by credit rating and fair value of protection sold (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |
Credit derivative, term | 5 years |
Notional amount | $ 3,886,000,000 | $ 3,478,000,000
Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 759,000,000 | 9,000,000
Fair value | (2,000,000) | 0
Single name | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 9,000,000 | 9,000,000
Fair value | 0 | 0
Corporate debt | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 750,000,000 |
Fair value | (2,000,000) |
AAA | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 6,000,000 | 0
AAA | Single name | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 0 | 0
AAA | Corporate debt | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 6,000,000 |
AA | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 12,000,000 | 0
AA | Single name | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 0 | 0
AA | Corporate debt | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 12,000,000 |
A | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 168,000,000 | 0
A | Single name | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 0 | 0
A | Corporate debt | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 168,000,000 |
BBB | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 510,000,000 | 0
BBB | Single name | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 0 | 0
BBB | Corporate debt | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 510,000,000 |
BB and lower | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 63,000,000 | 9,000,000
BB and lower | Single name | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | 9,000,000 | $ 9,000,000
BB and lower | Corporate debt | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 54,000,000 |

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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