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EMPLOYEE BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
et periodic benefit costs recognized included the following components for the three and six months ended June 30, 2016 (in millions). Amounts recognized in relation to all other plans were immaterial to the quarter. 
 
Qualified Defined - Benefit Plans
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Service cost
$
9

 
$
10

 
$
18


$
20

Interest cost
19

 
21

 
37


42

Expected return on assets
(27
)
 
(30
)
 
(54
)

(61
)
Recognized actuarial loss (gain)
6

 
6

 
12


13

Total
$
7

 
$
7

 
$
13


$
14