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Investments and Cash - Net Realized Investment Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]        
Gross realized gains on available-for-sale securities $ 29 $ 5 $ 48 $ 16
Gross realized losses on available-for-sale securities (1) (3) (4) (9)
Net realized gains (losses) on other invested assets 0 0 0 (1)
Total OTTI (12) (8) (29) (23)
Less: portion of OTTI recognized in OCI 0 1 3 (3)
Net OTTI recognized in net income (loss) (12) (9) (32) (20)
Net realized investment gains (losses) $ 16 $ (7) $ 12 $ (14)