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Derivative Financial Instruments and Off-balance sheet Financial Instruments - CDS notional amounts by credit rating (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Derivative Financial Instruments and Off-balance sheet Financial Instruments |  |
Term of credit default swaps | 5 years |
Credit Derivatives |  |
Derivative, notional amount | $ 5,191 | $ 3,478
Credit default contracts |  |
Credit Derivatives |  |
Derivative, notional amount | 759 | 9
Fair value | 13 | 0
Credit default contracts | Single name | Corporate |  |
Credit Derivatives |  |
Derivative, notional amount | 9 | 9
Fair value | 0 | 0
Credit default contracts | Index | Corporate |  |
Credit Derivatives |  |
Derivative, notional amount | 750 |
Fair value | 13 |
AAA | Credit default contracts |  |
Credit Derivatives |  |
Derivative, notional amount | 6 | 0
AAA | Credit default contracts | Single name | Corporate |  |
Credit Derivatives |  |
Derivative, notional amount | 0 | 0
AAA | Credit default contracts | Index | Corporate |  |
Credit Derivatives |  |
Derivative, notional amount | 6 |
AA | Credit default contracts |  |
Credit Derivatives |  |
Derivative, notional amount | 12 | 0
AA | Credit default contracts | Single name | Corporate |  |
Credit Derivatives |  |
Derivative, notional amount | 0 | 0
AA | Credit default contracts | Index | Corporate |  |
Credit Derivatives |  |
Derivative, notional amount | 12 |
A | Credit default contracts |  |
Credit Derivatives |  |
Derivative, notional amount | 156 | 0
A | Credit default contracts | Single name | Corporate |  |
Credit Derivatives |  |
Derivative, notional amount | 0 | 0
A | Credit default contracts | Index | Corporate |  |
Credit Derivatives |  |
Derivative, notional amount | 156 |
BBB | Credit default contracts |  |
Credit Derivatives |  |
Derivative, notional amount | 492 | 0
BBB | Credit default contracts | Single name | Corporate |  |
Credit Derivatives |  |
Derivative, notional amount | 0 | 0
BBB | Credit default contracts | Index | Corporate |  |
Credit Derivatives |  |
Derivative, notional amount | 492 |
BB and lower | Credit default contracts |  |
Credit Derivatives |  |
Derivative, notional amount | 93 | 9
BB and lower | Credit default contracts | Single name | Corporate |  |
Credit Derivatives |  |
Derivative, notional amount | 9 | $ 9
BB and lower | Credit default contracts | Index | Corporate |  |
Credit Derivatives |  |
Derivative, notional amount | $ 84 |

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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=121590274&loc=SL5708775-113959 + Details
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