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Income Taxes (Tax Loss and Credit Carryforwards Expirations) (Details) $ in Millions | Dec. 31, 2016 USD ($)
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Income Tax Disclosure [Abstract] |
2017 | $ 5
2018 | 21
2019 | 30
2020 | 44
2021 | 48
Thereafter | 253
Unlimited | $ 79

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