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Asset Impairments (Tables)
3 Months Ended
Mar. 31, 2014
Asset Impairments [Abstract]  
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]
Pre-tax (non-cash) asset impairment charges were as follows:
 
Three Months Ended March 31,
(millions)
2014
 
2013
North Sea Property
$
92

 
$

Non-Core US Property
5

 

Total
$
97

 
$