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Property Transactions (Tables)
 12 Months Ended
Dec. 31, 2014
Schedule of Disposal Groups, Gain on Divestitures - Onshore US
The information regarding the assets sold is as follows:
 
 
Year Ended December 31,
(millions)
 
2014
 
2013
2012
Cash Proceeds
 
$
135

 
$
150

$
1,044

Less
 
 
 
 
 
     Net Book Value of Assets Sold
 
(150
)
 
(117
)
(836
)
     Goodwill Allocated to Assets Sold
 
(7
)
 
(8
)
(61
)
     Asset Retirement Obligations Associated with Assets Sold
 
48

 
8

20

     Other Closing Adjustments
 
10

 
3

(13
)
Gain on Divestitures
 
$
36

 
$
36

$
154
Schedule of Disposal Groups, Gain on Divestitures - China
The information regarding the China assets sold is as follows:
 
Year Ended December 31, 2014
(millions)
2014
Sales Proceeds
$
186

Less
 
     Net Book Value of Assets Sold
(149
)
     Other Closing Adjustments
(2
)
Gain on Divestiture
$
35
North Sea Assets [Member]  
Summary of Discontinued Operations
Summarized results of discontinued operations are as follows:
 
Year Ended December 31,
(millions)
2013
 
2012
Oil and Gas Sales
$
37

 
$
208

Income Before Income Taxes (1)
12

 
101

Income Tax Expense
6

 
55

Operating Income, Net of Tax
6

 
46

Gain on Sale, Net of Tax
65

 
16

Discontinued Operations, Net of Tax
$
71

 
$
62

(1) Income before income taxes for 2012 includes exploration expense of $27 million related to the Selkirk field which was determined uneconomic for joint development.