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Debt (Tables)
3 Months Ended
Mar. 31, 2015
Debt Disclosure [Abstract]  
Outstanding letters of credit under committed lines of credit
We had outstanding letters of credit under our committed credit facilities as follows (in millions):
 
 
 
 
 
Amounts Outstanding
 
Borrowing
Capacity
 
Expiration
 
March 31,
2015
 
December 31,
2014
Letter of credit facilities
$
550

 
June 2015
 
$

 
$
56

Revolver
$
3,000

 
November 2018
 
$
64

 
$
54

VLP Revolver
$
300

 
December 2018
 
$

 
$

Canadian Revolver
C$
50

 
November 2015
 
C$
10

 
C$
10