INCOME TAXES - COMPONENTS OF TAX EXPENSE (DETAILS) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current tax expense (benefit):
Federal	$ 229us-gaap_CurrentFederalTaxExpenseBenefit	$ 145us-gaap_CurrentFederalTaxExpenseBenefit	$ 83us-gaap_CurrentFederalTaxExpenseBenefit
State	27	17	11
Total current	256us-gaap_CurrentIncomeTaxExpenseBenefit	162us-gaap_CurrentIncomeTaxExpenseBenefit	94us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense:
Federal	103	131	94
State	11	15	10
Total deferred	114us-gaap_DeferredIncomeTaxExpenseBenefit	146us-gaap_DeferredIncomeTaxExpenseBenefit	104us-gaap_DeferredIncomeTaxExpenseBenefit
Total tax expense related to income	$ 370us-gaap_IncomeTaxExpenseBenefit	$ 308us-gaap_IncomeTaxExpenseBenefit	$ 198us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.