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Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred Tax Liabilities: |  |
Differences between book and tax basis of property | $ (1,426) | $ (1,418)
Other taxable temporary differences | (287) | (243)
Deferred Tax Liabilities, Gross | (1,713) | (1,661)
Deferred Tax Assets: |  |
Operating loss carryforwards | 1,060 | 1,066
Capital loss carryforwards | 57 | 52
Bad debt and other book provisions | 74 | 62
Tax credit carryforwards | 33 | 55
Other deductible temporary differences | 256 | 111
Total gross deferred tax asset | 1,480 | 1,346
Less: valuation allowance | (824) | (868)
Total net deferred tax asset | 656 | 478
Total deferred tax liability | $ (1,057) | $ (1,183)

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