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Investments - Investments - Past-Due Mortgage Loans (Details) - Commercial Loan [Member] - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,900 | $ 4,531
Mortgages [Member] | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 0 | $ 0

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