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Investments - Mortgage Loans- ACL (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2020 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Mortgage loans (net of ACL of $38 and $—) |  | $ 0 |  |  |
Retained Earnings (Accumulated Deficit) | $ 13,918 | 12,685 |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Mortgage loans (net of ACL of $38 and $—) |  |  |  | $ (19) |
Retained Earnings (Accumulated Deficit) |  |  |  | 12,667 |
Commercial Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Mortgage loans (net of ACL of $38 and $—) | (38) | 0 | $ (1) |  | $ (1)
Financing Receivable, Credit Loss, Expense (Reversal) | 19 | $ 1 | $ 0 |  |
Commercial Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Retained Earnings (Accumulated Deficit) | $ 19 |  |  |  |
Commercial Loan [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Mortgage loans (net of ACL of $38 and $—) |  |  |  | $ (19) |

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