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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
(In millions)
2014
 
2013
Accounts receivable
$
2,215

 
$
2,534

Allowance for doubtful accounts
(89
)
 
(99
)
 
$
2,126

 
$
2,435