EMPLOYEE BENEFIT PLANS - Asset Allocations (Details) - AB Qualified Retirement Plan	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations (as a percent)	100.00%	100.00%
Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations (as a percent)	24.00%	49.40%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations (as a percent)	56.00%	38.80%
Equity real estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations (as a percent)	0.00%	9.80%
Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations (as a percent)	0.00%	1.30%
Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations (as a percent)	20.00%	0.70%