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Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred Tax Liabilities: |  |
Differences between book and tax basis of property | $ (1,418) | $ (1,424)
Other taxable temporary differences | (243) | (143)
Deferred Tax Liabilities, Gross | (1,661) | (1,567)
Deferred Tax Assets: |  |
Operating loss carryforwards | 1,066 | 1,439
Capital loss carryforwards | 52 | 63
Bad debt and other book provisions | 62 | 66
Tax credit carryforwards | 55 | 51
Other deductible temporary differences | 111 | 60
Total gross deferred tax asset | 1,346 | 1,679
Less: valuation allowance | (868) | (988)
Total net deferred tax asset | 478 | 691
Total deferred tax liability | $ (1,183) | $ (876)

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