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Divestitures (Tables)
9 Months Ended
Sep. 30, 2013
Acquisitions and Dispositions [Abstract]  
Discontinued Operations Balance Sheet and Income Statement Disclosures [Table Text Block]
Summarized results of discontinued operations are as follows:
 
Three Months Ended September 30,
Nine Months Ended
September 30,
 
2013
 
2012
2013
 
2012
(millions)
 
 
 
 
 
 
Oil and Gas Sales
$
11

 
$
54

$
32

 
$
194

Income Before Income Taxes
7

 
38

10

 
117

Income Tax Expense
(3
)
 
3

7

 
50

Operating Income (Loss), Net of Tax
10

 
35

3

 
67

Gain on Sale, Net of Tax

 
22

55

 
22

Discontinued Operations, Net of Tax
$
10

 
$
57

$
58

 
$
89

Schedule of Disposal Groups, Gain on Asset Onshore Divestitures [Table Text Block]
Onshore US Properties   During the first nine months of 2013, we closed the sales of certain crude oil and natural gas properties in Kansas, Oklahoma and the Gulf Coast areas. The information regarding the assets sold is as follows:
 
Nine Months Ended
September 30,
 
2013
(millions)
 
Sales Proceeds
$
60

Less
 
     Net Book Value of Assets Sold
(53
)
     Goodwill Allocated to Assets Sold
(4
)
     Asset Retirement Obligations Associated with Assets Sold
5

     Other Closing Adjustments
4

Gain on Divestitures
$
12