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Derivative Financial Instruments - CDS notional amount by credit rating and fair value of protection sold (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 1,862 | $ 2,075
Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 255
Fair value |  | 6
Single name | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 5
Fair value |  | 0
Index | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 250
Fair value |  | 6
AAA | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 2
AAA | Single name | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 0
AAA | Index | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 2
AA | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 4
AA | Single name | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 0
AA | Index | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 4
A | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 46
A | Single name | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 0
A | Index | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 46
BBB | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 190
BBB | Single name | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 0
BBB | Index | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 190
BB and lower | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 13
BB and lower | Single name | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 5
BB and lower | Index | Corporate | Credit default contracts |  |
Derivative [Line Items] |  |
Notional amount |  | $ 8

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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 https://asc.fasb.org/extlink&oid=125515794&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 https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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