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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2012
Income Taxes [Abstract]  
Reconciliation of Total Gross Unrecognized Tax Benefits [Table Text Block]
(millions)  
December 31, 2011$ 66
Tax positions related to current year:  
 Additions   2
 Reductions   -
Tax positions related to prior years:  
 Additions   -
 Reductions   -
Settlements   -
March 31, 2012$ 68