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Investments (Average Carrying Value On The Impaired Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Information about impaired mortgage loans on real estate |  |  |  |
Average carrying value for impaired mortgage loans on real estate | $ 5 | $ 8 | $ 5 | $ 6

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