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EMPLOYEE BENEFIT PLANS
 3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
EMPLOYEE BENEFIT PLANS
EMPLOYEE BENEFIT PLANS

Net periodic benefit costs recognized included the following components for the three months ended March 31, 2014 (in millions): 
 
Three Months Ended March 31,
 
Qualified
 
Nonqualified
 
Postretirement Medical
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost
$
8

 
$
11

 
$
—

 
$
—

 
$
1

 
$
1

Interest cost
20

 
18

 
—

 
1

 
1

 
1

Expected return on assets
(29
)
 
(27
)
 
—

 
—

 
—

 
—

Amortization of prior service cost
—

 
—

 
—

 
—

 
—

 
—

Recognized actuarial loss (gain)
3

 
10

 
—

 
—

 
(1
)
 
—

Total
$
2

 
$
12

 
$
—

 
$
1

 
$
1

 
$
2