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EMPLOYEE BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Qualified
 
Postretirement Medical
 
2015
 
2014
 
2015
 
2014
Service cost
$
11

 
$
8

 
$
1

 
$
1

Interest cost
21

 
21

 
—

 
1

Expected return on assets
(31
)
 
(30
)
 
—

 
—

Amortization of prior service cost
(1
)
 
—

 
—

 
—

Recognized actuarial loss (gain)
7

 
3

 
(3
)
 
(1
)
Total
$
7

 
$
2

 
$
(2
)
 
$
1



Net periodic benefit costs recognized in the consolidated statements of operations (in millions): 
 
Nine Months Ended September 30,
 
Qualified
 
Postretirement Medical
 
2015
 
2014
 
2015
 
2014
Service cost
$
31

 
$
24

 
$
2

 
$
2

Interest cost
63

 
61

 
2

 
3

Expected return on assets
(92
)
 
(88
)
 
—

 
—

Amortization of prior service cost
(1
)
 
(1
)
 
—

 
—

Recognized actuarial loss (gain)
20

 
10

 
(8
)
 
(2
)
Total
$
21

 
$
6

 
$
(4
)
 
$
3