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Investments - Investments - ACL on Mortgages (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Retained earnings | $ 14,813 |  | $ 14,813 |  | $ 13,918 |
Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Beginning balance | (34) | $ (21) | (38) | $ 0 |  |
Financing Receivable, Allowance for Credit Loss | (24) | (43) | (24) | (43) | $ (38) |
Current period provision | (10) | 22 | (14) | 24 |  |
Ending balance | $ (24) | $ (43) | $ (24) | $ (43) |  |
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] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  |  |  | $ (19)

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