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Supplemental Cash Flow Information Supplemental Cash Flow Information - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract] |  |
Transfer from Investments | $ 41 | $ 9
Non-cash financing activities related to the issuance of shares for vested restricted stock units | $ 30 | $ 42

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