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Income Taxes Schedule of Deferred tax Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred income tax assets: |  |
Price risk management | $ 77 | $ 145
Employee benefits | 162 | 135
Deferred Tax Assets, tax credits, net of valuation allowance | 55 | 56
Deferred income taxes | 20 | 22
Tax loss carryforwards | 0 | 1
Total deferred income tax assets | 314 | 359
Deferred income tax liabilities: |  |
Depreciation and amortization | 623 | 572
Regulatory assets | 224 | 274
Other | 4 | 9
Total deferred income tax liabilities | 851 | 855
Deferred income tax liability, net | (537) | (496)
Classification of net deferred income taxes: |  |
Current deferred income tax asset | 51 | 33
Noncurrent deferred income tax liability | $ (588) | $ (529)

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