EMPLOYEE BENEFITS - Fair Value of Plan Assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 923	$ 1,031
Cash and cash equivalents | Cash and money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18	8
Mutual funds | International equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24	28
Mutual funds | Income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39	43
Common and collective funds | International equity common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		115
Common and collective funds | Global equities common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	241
Common and collective funds | Balanced common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		474
Common and collective funds | Fixed income common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	305	117
Managed portfolio | Cash and money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(6)	1
Managed portfolio | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	85	105
Managed portfolio | Municipal obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	2
Managed portfolio | U.S. government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17	9
Managed portfolio | Non-U.S. government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	3
Managed portfolio | Derivative assets - credit default swaps
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1
Managed portfolio | Derivative liabilities - interest rate swaps
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(1)
Managed portfolio | Derivative liabilities - foreign currency futures
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(1)
Managed portfolio | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14
Limited partnerships | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	183	126
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24	28
Level 1 | Cash and cash equivalents | Cash and money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Mutual funds | International equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24	28
Level 1 | Mutual funds | Income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Common and collective funds | International equity common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Level 1 | Common and collective funds | Global equities common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 1 | Common and collective funds | Balanced common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Level 1 | Common and collective funds | Fixed income common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Managed portfolio | Cash and money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Managed portfolio | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Managed portfolio | Municipal obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Managed portfolio | U.S. government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Managed portfolio | Non-U.S. government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Managed portfolio | Derivative assets - credit default swaps
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 1 | Managed portfolio | Derivative liabilities - interest rate swaps
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 1 | Managed portfolio | Derivative liabilities - foreign currency futures
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 1 | Managed portfolio | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 1 | Limited partnerships | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	899	1,003
Level 2 | Cash and cash equivalents | Cash and money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18	8
Level 2 | Mutual funds | International equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Mutual funds | Income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39	43
Level 2 | Common and collective funds | International equity common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		115
Level 2 | Common and collective funds | Global equities common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	241
Level 2 | Common and collective funds | Balanced common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		474
Level 2 | Common and collective funds | Fixed income common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	305	117
Level 2 | Managed portfolio | Cash and money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(6)	1
Level 2 | Managed portfolio | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	85	105
Level 2 | Managed portfolio | Municipal obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	2
Level 2 | Managed portfolio | U.S. government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17	9
Level 2 | Managed portfolio | Non-U.S. government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	3
Level 2 | Managed portfolio | Derivative assets - credit default swaps
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1
Level 2 | Managed portfolio | Derivative liabilities - interest rate swaps
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(1)
Level 2 | Managed portfolio | Derivative liabilities - foreign currency futures
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(1)
Level 2 | Managed portfolio | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14
Level 2 | Limited partnerships | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	183	126
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Cash and cash equivalents | Cash and money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Mutual funds | International equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Mutual funds | Income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Common and collective funds | International equity common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Level 3 | Common and collective funds | Global equities common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 3 | Common and collective funds | Balanced common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Level 3 | Common and collective funds | Fixed income common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Managed portfolio | Cash and money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Managed portfolio | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Managed portfolio | Municipal obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 3 | Managed portfolio | U.S. government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Managed portfolio | Non-U.S. government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Managed portfolio | Derivative assets - credit default swaps
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 3 | Managed portfolio | Derivative liabilities - interest rate swaps
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 3 | Managed portfolio | Derivative liabilities - foreign currency futures
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 3 | Managed portfolio | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 3 | Limited partnerships | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0