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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure
 
 
 
Additions
 
 
 
 
(millions)
Balance at beginning of period
 
Charged to costs and expenses
 
Charged to other accounts
 
Deductions (a)
 
Balance at end of period
Year ended December 31, 2013:
 
 
 
 
 
 
 
 
 
Doubtful accounts
$
14

 
$
—

 
$
1

 
$
(5
)
 
$
10

Cash discounts
2

 
42

 
—

 
(42
)
 
2

Income tax valuation allowance
1,125

 
(2
)
 
—

 
(128
)
 
995

Year ended December 31, 2012:
 
 
 
 

 
 
 
 
Doubtful accounts
15

 
7

 
—

 
(8
)
 
14

Cash discounts
2

 
38

 
—

 
(38
)
 
2

Income tax valuation allowance
1,042

 
1

 
82

 
—

 
1,125

Year ended December 31, 2011:
 
 
 
 

 
 
 
 
Doubtful accounts
14

 
9

 
—

 
(8
)
 
15

Cash discounts
2

 
33

 
—

 
(33
)
 
2

Income tax valuation allowance
884

 
—

 
158

 
—

 
1,042


 
(a)
Reflects receivables written off as related to doubtful accounts, discounts allowed as related to cash discounts and reductions in the income tax valuation allowance.