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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
 
 
Balance,

 
 
 
 
 
Balance,

 
 
Beginning of

 
 
 
 
 
End of

(MILLIONS OF DOLLARS)
 
Period

 
Additions

 
Deductions

 
Period

Year Ended December 31, 2014
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
31

 
$
5

 
$
(4
)
 
$
32

 
 
 
 
 
 
 
 
 
Year Ended December 31, 2013
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
49

 
6

 
(24
)
(a) 
31

 
 
 
 
 
 
 
 
 
Year Ended December 31, 2012
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
29

 
23

 
(3
)
 
49

 
 
 
 
 
 
 
 
 
(a) Primarily reflects Separation Adjustments (see Notes to Consolidated and Combined Financial Statements—Note 2B. The Separation, Adjustments Associated with the Separation, Senior Notes Offering, Initial Public Offering and Exchange Offer— Adjustments Associated with the Separation) as well as an adjustment related to improved accounts receivable collection experience.