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Investments - Investments - ACL on Mortgages (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  | $ 0 |  |  |  |
Retained earnings |  |  |  |  | $ (13,503) |  | $ (12,685)
Financing Receivable, Allowance for Credit Loss |  |  | 0 |  |  |  | 0
Commercial Loan [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Beginning balance | $ (43) | $ 0 | 0 | $ (1) |  |  |
Financing Receivable, Allowance for Credit Loss | (43) | 0 | (38) | 0 | $ (38) |  | $ 0
Current period provision | (5) | 0 | 19 | (1) |  |  |
Ending balance | (38) | $ 0 | $ (38) | $ 0 |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial Loan [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  | $ 19 |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  | (12,667) |
Financing Receivable, Allowance for Credit Loss |  |  |  |  |  | (19) |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial Loan [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Beginning balance | 43 |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 43 |  |  |  |  | $ (19) |

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