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INCOME TAXES - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Federal statutory rate 35.00% 35.00% 35.00%
State income taxes, net of federal benefit 1.70% 3.40% 1.70%
Foreign income tax rate differential (4.60%) (0.30%) (2.30%)
Audit settlements (1.70%) (2.40%) (0.70%)
Effect of tax law changes 0.40% 1.20% (0.30%)
Nondeductible legal and related expenses 0.30% 18.30% 0.80%
Basis difference in affiliates (0.00%) (2.50%) (0.00%)
Tax advantaged investments (1.80%) (3.60%) (3.00%)
Other, net 0.70% (0.10%) 0.00%
Effective income tax rate 30.00% 49.00% 31.20%
DTA change in enacted tax rate $ 101 $ 210