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Investments - Investments - Accrued Interest Receivable on Fixed Maturities, AFS and Mortgage Loans (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Interest Receivable | $ 331 | $ 334
Mortgages [Member] |  |
Schedule of Investments [Line Items] |  |
Interest Receivable | $ 14 | $ 14

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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | debit
Period Type: | instant

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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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Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |