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Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred Tax Liabilities: |  |
Differences between book and tax basis of property | $ (2,240) | $ (2,364)
Other taxable temporary differences | (299) | (302)
Deferred Tax Liabilities, Gross | 2,539 | 2,666
Deferred Tax Assets: |  |
Operating loss carryforwards | 2,206 | 2,224
Capital loss carryforwards | 66 | 137
Bad debt and other book provisions | 191 | 221
Retirement costs | 149 | 275
Tax credit carryforwards | 55 | 58
Other deductible temporary differences | 219 | 363
Total gross deferred tax asset | 2,886 | 3,278
Less: valuation allowance | (894) | (997)
Total net deferred tax asset | 1,992 | 2,281
Total deferred tax liability | $ (547) | $ (385)

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