Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS (Asset Allocation Ranges and Actual Allocation, USRIP)) (Details)

v3.6.0.2
BENEFIT PLANS (Asset Allocation Ranges and Actual Allocation, USRIP)) (Details) - USRIP
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Large-Cap Equity    
Weighted-average assumptions used to determine net periodic benefit cost at December 31,    
Range minimum 15.00% 15.00%
Range maximum 40.00% 40.00%
Actual 27.30% 25.90%
Small- and Mid-Cap Equity    
Weighted-average assumptions used to determine net periodic benefit cost at December 31,    
Range minimum 0.00% 0.00%
Range maximum 15.00% 15.00%
Actual 6.70% 6.10%
International Equity    
Weighted-average assumptions used to determine net periodic benefit cost at December 31,    
Range minimum 10.00% 10.00%
Range maximum 30.00% 30.00%
Actual 12.30% 12.00%
Private Equity    
Weighted-average assumptions used to determine net periodic benefit cost at December 31,    
Range minimum 2.00% 2.00%
Range maximum 10.00% 10.00%
Actual 7.20% 8.80%
Hedge Funds    
Weighted-average assumptions used to determine net periodic benefit cost at December 31,    
Range minimum 0.00% 0.00%
Range maximum 10.00% 10.00%
Actual 7.20% 11.40%
Real Assets    
Weighted-average assumptions used to determine net periodic benefit cost at December 31,    
Range minimum 2.00% 2.00%
Range maximum 10.00% 10.00%
Actual 4.10% 3.70%
Fixed Income    
Weighted-average assumptions used to determine net periodic benefit cost at December 31,    
Range minimum 20.00% 20.00%
Range maximum 55.00% 55.00%
Actual 32.30% 29.70%
Cash    
Weighted-average assumptions used to determine net periodic benefit cost at December 31,    
Range minimum 0.00% 0.00%
Range maximum 15.00% 15.00%
Actual 2.90% 2.40%