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Fair Value (Tables)
 12 Months Ended
Dec. 31, 2013
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
 
Asset fair value measurements using
 
Total
 
Quoted prices in
active markets
for identical
assets (Level 1)
 
Significant other
observable
inputs (Level 2)
 
Significant
unobservable
inputs (Level 3)
As of December 31, 2013
 
 
 
 
 
 
 
Energy commodity derivative contracts(a)
$
80

 
$
4

 
$
46

 
$
30

Interest rate swap agreements
$
217

 
$
—

 
$
217

 
$
—

As of December 31, 2012
 
 
 
 
 
 
 
Energy commodity derivative contracts(a)
$
86

 
$
3

 
$
76

 
$
7

Interest rate swap agreements
$
603

 
$
—

 
$
603

 
$
—


 
Liability fair value measurements using
 
Total
 
Quoted prices in
active markets
for identical
liabilities (Level 1)
 
Significant other
observable
inputs (Level 2)
 
Significant
unobservable
inputs (Level 3)
As of December 31, 2013
 
 
 
 
 
 
 
Energy commodity derivative contracts(a)
$
(68
)
 
$
(6
)
 
$
(31
)
 
$
(31
)
Interest rate swap agreements
$
(116
)
 
$
—

 
$
(116
)
 
$
—

As of December 31, 2012
 
 
 
 
 
 
 
Energy commodity derivative contracts(a)
$
(33
)
 
$
(3
)
 
$
(26
)
 
$
(4
)
Interest rate swap agreements
$
(1
)
 
$
—

 
$
(1
)
 
$
—

____________
(a)
Level 1 consists primarily of NYMEX natural gas futures. Level 2 consists primarily of OTC WTI swaps and OTC natural gas swaps that are settled on NYMEX. Level 3 consists primarily of WTI options and NGL options.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
The table below provides a summary of changes in the fair value of our Level 3 energy commodity derivative contracts for each of the years ended December 31, 2013 and 2012 (in millions):
Significant unobservable inputs (Level 3)
 
Year Ended December 31,
 
2013
 
2012
Derivatives-net asset (liability)
 
 
 
Beginning of Period
$
3

 
$
7

Total gains or (losses):
 
 
 
Included in earnings
(4
)
 
(1
)
Included in other comprehensive income
(1
)
 
(1
)
Purchases(a)
17

 
3

Settlements
(16
)
 
(5
)
End of Period
$
(1
)
 
$
3

The amount of total gains or (losses) for the period included in earnings attributable to the change in unrealized gains or (losses) relating to assets held at the reporting date
$
(6
)
 
$
—
Fair Value, by Balance Sheet Grouping
 
December 31, 2013
 
December 31, 2012
 
Carrying
Value
 
Estimated
Fair value
 
Carrying
Value
 
Estimated
Fair value
Total debt
$
21,128

 
$
21,550

 
$
18,760

 
$
20,439