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Divestitures (Tables)
3 Months Ended
Mar. 31, 2014
Divestitures [Abstract]  
Discontinued Operations Balance Sheet and Income Statement Disclosures [Table Text Block]
Summarized results of discontinued operations are as follows:
 
Three Months Ended
March 31,
(millions)
2013
Oil and Gas Sales
$
10

Income Before Income Taxes
(1
)
Income Tax Expense
7

Operating Income (Loss), Net of Tax
(8
)
Gain on Sale, Net of Tax
37

Discontinued Operations, Net of Tax
$
29

Schedule of Disposal Groups, Gain on Asset Onshore Divestitures [Table Text Block]
Onshore US Properties   During the first three months of 2014, we sold certain non-core onshore US crude oil and natural gas properties. The information regarding the assets sold is as follows:
 
Three Months Ended
March 31,
(millions)
2014
Sales Proceeds
$
92

Less
 
     Net Book Value of Assets Sold
(106
)
     Goodwill Allocated to Assets Sold
(6
)
     Asset Retirement Obligations Associated with Assets Sold
20

     Other Closing Adjustments
(1
)
Loss on Divestitures
$
(1
)