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Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Tax Liabilities: |  |
Differences between book and tax basis of property | $ (1,424) | $ (1,926)
Other taxable temporary differences | (143) | (335)
Deferred Tax Liabilities, Gross | 1,567 | 2,261
Deferred Tax Assets: |  |
Operating loss carryforwards | 1,439 | 2,088
Capital loss carryforwards | 63 | 59
Bad debt and other book provisions | 66 | 96
Tax credit carryforwards | 51 | 54
Other deductible temporary differences | 60 | 263
Total gross deferred tax asset | 1,679 | 2,560
Less: valuation allowance | (988) | (876)
Total net deferred tax asset | 691 | 1,684
Total deferred tax liability | $ (876) | $ (577)

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