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EMPLOYEE BENEFIT PLANS - AMOUNTS IN ACCUMULATED OTHER COMPREHENSIVE INCOME (DETAILS)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Pension Benefits  
Employee Benefit Plans  
Unrecognized prior service credit $ 5
Unrecognized prior service credit, net of tax 3
Unrecognized actuarial loss 182
Unrecognized actuarial gain (loss), net of tax 118
Prior service cost and unrecognized actuarial losses included in accumulated other comprehensive income that is expected to be recognized in net periodic benefit costs in 2016 10
Prior service cost and unrecognized actuarial losses included in accumulated other comprehensive income that is expected to be recognized in net periodic benefit costs in 2016, net of tax 6
Postretirement Benefits  
Employee Benefit Plans  
Unrecognized prior service credit 1
Unrecognized prior service credit, net of tax 1
Unrecognized actuarial loss 4
Unrecognized actuarial gain (loss), net of tax $ 3