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Investments (Tables)
12 Months Ended
Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]  
Investments
Investments
(Millions)
2013
 
2012
Investments in equity affiliates
$
245

 
$
262

Marketable equity securities - Trading (See Note 13)
70

 
60

Other
 
78

 
100

 
Total
$
393

 
$
422