EMPLOYEE BENEFIT PLANS - Restricted Stock (Details) $ / shares in Units, $ in Millions	1 Months Ended		9 Months Ended
	May 31, 2016 shares	Jan. 31, 2016 director $ / shares shares	Sep. 30, 2016 USD ($) $ / shares shares
Non Employee Directors
Other Disclosures
Restricted stock that will vest and be settled on the third anniversary of the grant date (in shares)	90,105
Restricted Stock Units
Restricted stock unit activity
Unvested at the beginning of the period (in shares)		3,627,232	3,627,232
Granted (in shares)			1,584,063
Vested (in shares)			(1,542,039)
Forfeited (in shares)			(348,694)
Unvested at the end of the period (in shares)			3,320,562
Weighted Average Grant Date Fair Value Per Unit
Unvested at the beginning of the period (in dollars per share) | $ / shares		$ 44.69	$ 44.69
Granted (in dollars per share) | $ / shares			30.43
Vested (in dollars per share) | $ / shares			43.18
Forfeited (in dollars per share) | $ / shares			33.92
Unvested at the end of the period (in dollars per share) | $ / shares			$ 38.54
Other Disclosures
Unrecognized compensation costs | $			$ 83
Period for recognition of unrecognized compensation costs			2 years
Restricted Stock Units | Time-vesting
Restricted stock unit activity
Granted (in shares)			717,277
Other Disclosures
Restricted stock that will vest and be settled over a three-year period from the grant date (in shares)			484,295
Restricted stock that will vest and be settled on the fifth anniversary of the grant date (in shares)			175,843
Restricted stock that will vest and be settled on the third anniversary of the grant date (in shares)			57,139
Vesting period			3 years
Restricted Stock Units | Time-vesting | Director
Other Disclosures
Initial grant received (in shares)		5,084
Pro-rated annual grant (in shares)		5,614
New directors | director		2
Restricted Stock Units | Performance-based vesting
Restricted stock unit activity
Granted (in shares)			291,540
Restricted Stock Units | Performance-based vesting | Minimum
Other Disclosures
Awards vesting (as a percent)			0.00%
Restricted Stock Units | Performance-based vesting | Maximum
Other Disclosures
Awards vesting (as a percent)			200.00%
Restricted Stock Units | Performance-based vesting | Senior Officers
Other Disclosures
Restricted stock that will vest and be settled on the third anniversary of the grant date (in shares)			474,443
Term for achievement of specified performance goal			3 years