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

X

- Definition

Tax loss and credit carryforwards, expire in after year five

+ References

No definition available.

+ Details

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- Definition

Tax loss and credit carryforwards, expire in year five

+ References

No definition available.

+ Details

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- Definition

Tax loss and credit carryforwards, expire in year four

+ References

No definition available.

+ Details

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- Definition

Tax loss and credit carryforwards, expire in year one

+ References

No definition available.

+ Details

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- Definition

Tax loss and credit carryforwards, expire in year three

+ References

No definition available.

+ Details

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- Definition

Tax loss and credit carryforwards, expire in year two

+ References

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- Definition

Tax loss and credit carryforwards, expire, unlimited

+ References

No definition available.

+ Details

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