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Investments Investments - Rollforward of credit loss allowance for bank loans (Details) - Bank loans, net - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items] |  |
Beginning balance | $ 0 |
Cumulative effect of change in accounting principle |  | $ (53)
Net (increases) decreases related to credit losses | (27) |
Reduction of allowance related to sales | 1 |
Ending balance | $ (79) |

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