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Investments Investments - Rollforward of credit loss allowance for mortgage loans (Details) - Mortgage loans - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | $ (3) |  |
Cumulative effect of change in accounting principle |  |  | $ (42)
Net (increases) decreases related to credit losses | (40) | $ 0 |
Ending balance | $ (85) |  |

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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