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Investments - Investments - ACL on Mortgages (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance | $ 0 |  |
Adjusted beginning balance | 0 |  | $ (19)
Accounting Standards Update 2016-13 [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  | 2
Commercial Loan [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance | 0 | $ (1) |
Adjusted beginning balance | (21) | (1) |
Current period provision | (2) | 0 |
Ending balance | $ (21) | $ (1) |
Commercial Loan [Member] | Accounting Standards Update 2016-13 [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  | 0
Commercial Loan, ACL [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Adjusted beginning balance |  |  | (19)
Commercial Loan, ACL [Member] | Accounting Standards Update 2016-13 [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  | $ (19)

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