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Income Taxes (Tax Loss and Credit Carryforwards Expirations) (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Income Tax Disclosure [Abstract] |
2018 | $ 15
2019 | 17
2020 | 30
2021 | 37
2022 | 166
Thereafter | 151
Unlimited | $ 87

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