OPERATIONS AND ORGANIZATION Restatement (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other Assets, Current	$ 72			$ 172
Assets, Current	241			350
Notes Receivable, Related Parties, Noncurrent	678			574
Assets	5,263			5,294
Accounts Payable, Related Parties, Current	89			125
Income Tax Expense (Benefit)	12	$ 12
Liabilities, Current	251			299
Deferred Tax Liabilities, Net, Noncurrent	726			725
Partners' Capital	2,914			2,883
Interest income - affiliates	7	0
Nonoperating Income (Expense)	(5)	(10)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	43	43
Net income	31	31
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	31	31
Increase (Decrease) in Deferred Income Taxes	1	0
Increase (Decrease) in Other Operating Assets and Liabilities, Net	65	4
Net Cash Provided by (Used in) Operating Activities	125	70
Repayment of Notes Receivable from Related Parties	6	0
Net Cash Provided by (Used in) Investing Activities	(106)	(55)
Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other Assets, Current	77
Assets, Current	246
Notes Receivable, Related Parties, Noncurrent	682
Assets	5,272
Accounts Payable, Related Parties, Current	66
Income Tax Expense (Benefit)		16
Liabilities, Current	228
Deferred Tax Liabilities, Net, Noncurrent	697
Partners' Capital	2,975
Interest income - affiliates	16
Nonoperating Income (Expense)	4
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	52
Net income		36
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		$ 36
Increase (Decrease) in Deferred Income Taxes	2
Increase (Decrease) in Other Operating Assets and Liabilities, Net	63
Net Cash Provided by (Used in) Operating Activities	129
Repayment of Notes Receivable from Related Parties	2
Net Cash Provided by (Used in) Investing Activities	(110)
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income Tax Expense (Benefit)	1		$ 6	$ 20	$ 36
Interest income - affiliates	9
Restatement Adjustment [Member] | InterestRelatedIncomeTax [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	$ 3