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Acquisition Of XTO Energy Inc. (Components Of Consideration Transferred In Merger Of XTO Energy Inc.) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended
Jun. 25, 2010
Dec. 31, 2010
Acquisition Of XTO Energy Inc. [Abstract]    
Consideration attributable to stock issued $ 24,480 [1],[2]  
Consideration attributable to converted stock options 179 [2]  
Total consideration transferred 24,659 24,659
Common stock fair market value per share $ 59.10  
Stock issued during period, shares, treasury stock reissued 416  
Stock issued during period, value, treasury stock reissued 21,139  
Excess fair value over cost of treasury stock issued used in XTO acquisition $ 3,520  
[1] The fair value of the Corporation's common stock on the acquisition date was $59.10 per share based on the closing value on the NYSE. The Corporation issued 416 million shares of stock previously held in treasury. The treasury stock issued, based on the average cost, was valued at $21,139 million. The excess of the fair value of the consideration transferred over the cost of treasury stock issued was $3,520 million and was included in common stock without par value.
[2] The portion of the fair value of XTO converted stock-based awards attributable to pre-merger employee service was part of consideration. The remaining fair value of the awards is recognized over the requisite service period.