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Income Taxes Schedule of Deferred tax Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Deferred income tax assets: |  |
Price risk management | $ 71 | $ 77
Employee benefits | 122 | 162
Deferred Tax Assets, tax credits, net of valuation allowance | 51 | 55
Deferred income taxes | 16 | 20
Deferred Tax Assets, Tax Deferred Expense, Other | 17 | 0
Total deferred income tax assets | 277 | 314
Deferred income tax liabilities: |  |
Depreciation and amortization | 646 | 623
Regulatory assets | 175 | 224
Other | 0 | 4
Total deferred income tax liabilities | 821 | 851
Deferred income tax liability, net | (544) | (537)
Classification of net deferred income taxes: |  |
Current deferred income tax asset | 42 | 51
Noncurrent deferred income tax liability | $ (586) | $ (588)

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