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EMPLOYEE BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
Net periodic benefit costs recognized in the consolidated statements of operations (in millions): 
 
Three Months Ended June 30,
 
Qualified
 
Postretirement Medical
 
2015
 
2014
 
2015
 
2014
Service cost
$
10

 
$
8

 
$
—

 
$
—

Interest cost
21

 
20

 
1

 
1

Expected return on assets
(30
)
 
(29
)
 
—

 
—

Amortization of prior service cost
—

 
(1
)
 
—

 
—

Recognized actuarial loss (gain)
6

 
4

 
(2
)
 
—

Total
$
7

 
$
2

 
$
(1
)
 
$
1



Net periodic benefit costs recognized in the consolidated statements of operations (in millions): 
 
Six Months Ended June 30,
 
Qualified
 
Postretirement Medical
 
2015
 
2014
 
2015
 
2014
Service cost
$
20

 
$
16

 
$
1

 
$
1

Interest cost
42

 
40

 
2

 
2

Expected return on assets
(61
)
 
(58
)
 
—

 
—

Amortization of prior service cost
—

 
(1
)
 
—

 
—

Recognized actuarial loss (gain)
13

 
7

 
(5
)
 
(1
)
Total
$
14

 
$
4

 
$
(2
)
 
$
2