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Allowance for Doubtful Accounts
 12 Months Ended
Dec. 31, 2013
Allowance for Doubtful Accounts [Abstract]  
Allowance for Doubtful Accounts
Allowance for Doubtful Accounts
Changes in the allowance for doubtful accounts were as follows:
 
 
Year Ended December 31,
(millions)
 
2013
 
2012
 
2011
Balance, Beginning of Period
 
$
10

 
$
9

 
$
27

Changes
 
 

 
 

 
 

Changes in Ecuador Receivable, Net(1)
 
—

 
—

 
(19
)
Other Changes
 
1

 
1

 
1

Net Changes
 
1

 
1

 
(18
)
Balance, End of Period
 
$
11

 
$
10

 
$
9

(1) 
During 2011, recovery of approximately $19 million for outstanding receivables was included in the final terms of our agreement to transfer our assets and the associated electricity concession and PSC to the Ecuadorian government. See Note 3. Property Transactions.