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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)