EMPLOYEE BENEFITS - Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 949	$ 923
Fair value of plan liabilities	2
Cash and cash equivalents | Cash and money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	18
Mutual funds | International equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	47	24
Mutual funds | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9
Mutual funds | Income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		39
Common and collective funds | Global equities common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	220	241
Common and collective funds | Balanced common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	196
Common and collective funds | Fixed income common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	120	305
Managed portfolio | Cash and money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	(6)
Managed portfolio | Income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	20
Managed portfolio | U.S. government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35	17
Managed portfolio | Non-U.S. government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	2
Managed portfolio | Municipal obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	2
Managed portfolio | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	84	85
Managed portfolio | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5
Managed portfolio | Mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1
Managed portfolio | Derivatives - interest rates
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	(1)
Fair value of plan liabilities	1
Managed portfolio | Derivatives - credit default swaps
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1
Fair value of plan liabilities	1
Managed portfolio | Derivatives - 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
International equity fund | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	107
International equity | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	95
Limited partnerships | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		183
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	47	24
Fair value of plan liabilities	0
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	47	24
Level 1 | Mutual funds | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 1 | Mutual funds | Income 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	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 | Income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	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 | Municipal obligations
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 | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 1 | Managed portfolio | Mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 1 | Managed portfolio | Derivatives - interest rates
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair value of plan liabilities	0
Level 1 | Managed portfolio | Derivatives - credit default swaps
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Fair value of plan liabilities	0
Level 1 | Managed portfolio | Derivatives - 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 | International equity fund | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 1 | International equity | Limited partnerships
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
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	902	899
Fair value of plan liabilities	2
Level 2 | Cash and cash equivalents | Cash and money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	18
Level 2 | Mutual funds | International equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Mutual funds | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9
Level 2 | Mutual funds | Income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		39
Level 2 | Common and collective funds | Global equities common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	220	241
Level 2 | Common and collective funds | Balanced common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	196
Level 2 | Common and collective funds | Fixed income common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	120	305
Level 2 | Managed portfolio | Cash and money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	(6)
Level 2 | Managed portfolio | Income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	20
Level 2 | Managed portfolio | U.S. government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35	17
Level 2 | Managed portfolio | Non-U.S. government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	2
Level 2 | Managed portfolio | Municipal obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	2
Level 2 | Managed portfolio | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	84	85
Level 2 | Managed portfolio | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5
Level 2 | Managed portfolio | Mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1
Level 2 | Managed portfolio | Derivatives - interest rates
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	(1)
Fair value of plan liabilities	1
Level 2 | Managed portfolio | Derivatives - credit default swaps
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1
Fair value of plan liabilities	1
Level 2 | Managed portfolio | Derivatives - 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 | International equity fund | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	107
Level 2 | International equity | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	95
Level 2 | Limited partnerships | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		183
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair value of plan liabilities	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 | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 3 | Mutual funds | Income 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	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 | Income funds
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 | Municipal obligations
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 | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 3 | Managed portfolio | Mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 3 | Managed portfolio | Derivatives - interest rates
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair value of plan liabilities	0
Level 3 | Managed portfolio | Derivatives - credit default swaps
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Fair value of plan liabilities	0
Level 3 | Managed portfolio | Derivatives - 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 | International equity fund | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 3 | International equity | Limited partnerships
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