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Investments - Investments - Securities Lending, Repurchase Agreements, and Other Collateral Transactions (Details) - USD ($) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Securities Lending Transactions: |  |  |
Required Collateral Held Under Securities Lending, Percentage |  | 100.00% |
Securities Loaned |  | $ 0 | $ 0
Reverse Repurchase Agreements, Other Collateral Transactions and Restricted Investments |  |  |
Securities for Reverse Repurchase Agreements |  | 23 | 30
Assets Held by Insurance Regulators |  | 2,500 | 2,600
Life and Annuity Insurance Product Line, Run-off Business |  |  |
Equity Method Investment, Realized Gain (Loss) on Disposal [Abstract] |  |  |
Proceeds from Sale of Equity Method Investments | $ 217 |  |
Equity Method Investment, Realized Gain (Loss) on Disposal | $ 46 | $ 46 |
Domestic |  |  |
Securities Lending Transactions: |  |  |
Securities Loaned, Collateral, Percentage Required at Origination |  | 102.00% |
Non-domestic |  |  |
Securities Lending Transactions: |  |  |
Securities Loaned, Collateral, Percentage Required at Origination |  | 105.00% |
US Treasury Securities [Member] |  |  |
Reverse Repurchase Agreements, Other Collateral Transactions and Restricted Investments |  |  |
Debt Securities, Available-for-sale, Restricted |  | $ 9 | 34
Maximum |  |  |
Securities Lending Transactions: |  |  |
Securities Loaned, Term |  | 90 days |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Reverse Repurchase Agreements, Other Collateral Transactions and Restricted Investments |  |  |
Deposit Assets |  | $ 62 | 54
Syndicate Policyholders [Member] | Debt Securities [Member] |  |  |
Reverse Repurchase Agreements, Other Collateral Transactions and Restricted Investments |  |  |
Debt Securities, Available-for-sale, Restricted |  | 682 | 661
Syndicate Policyholders [Member] | Short-term investments |  |  |
Reverse Repurchase Agreements, Other Collateral Transactions and Restricted Investments |  |  |
Restricted Investments, Current |  | 2 | 26
Lloyd's of London [Member] | Debt Securities [Member] |  |  |
Reverse Repurchase Agreements, Other Collateral Transactions and Restricted Investments |  |  |
Debt Securities, Available-for-sale, Restricted |  | $ 170 | $ 175

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- Definition Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=123600598&loc=SL75763979-209797 + Details
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- Definition The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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- Definition This element represents the current portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120413209&loc=SL6242269-115581 + Details
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- Definition Amount, after the effects of master netting arrangements, of securities loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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