SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Restatement (Details) - USD ($)	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts Payable, Related Parties, Current	$ 125,000,000	$ 63,000,000	$ 34,000,000	$ 39,000,000	$ 43,000,000	$ 463,000,000	$ 452,000,000	$ 467,000,000	$ 34,000,000	$ 452,000,000	$ 63,000,000	$ 463,000,000	$ 125,000,000	$ 43,000,000
Income Tax Expense (Benefit)	17,000,000	23,000,000	0	12,000,000	47,000,000	8,000,000	23,000,000	104,000,000	12,000,000	127,000,000	35,000,000	135,000,000	52,000,000	182,000,000	$ 98,000,000
Liabilities, Current	299,000,000	244,000,000	212,000,000	204,000,000	242,000,000	688,000,000	727,000,000	776,000,000	212,000,000	727,000,000	244,000,000	688,000,000	299,000,000	242,000,000
Deferred Tax Liabilities, Net, Noncurrent	725,000,000	779,000,000	1,534,000,000	1,542,000,000	1,539,000,000	1,458,000,000	1,467,000,000	1,467,000,000	1,534,000,000	1,467,000,000	779,000,000	1,458,000,000	725,000,000	1,539,000,000
General Partners' Capital Account	2,881,000,000	2,812,000,000	2,940,000,000	2,920,000,000	2,889,000,000	2,918,000,000	2,908,000,000	2,928,000,000	2,940,000,000	2,908,000,000	2,812,000,000	2,918,000,000	2,881,000,000	2,889,000,000
Partners' Capital	2,883,000,000	2,813,000,000	2,941,000,000	2,920,000,000	2,889,000,000	2,920,000,000	2,910,000,000	2,930,000,000	2,941,000,000	2,910,000,000	2,813,000,000	2,920,000,000	2,883,000,000	2,889,000,000	3,068,000,000	$ 4,028,000,000
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	30,000,000	25,000,000	19,000,000	31,000,000	(36,000,000)	23,000,000	7,000,000	(33,000,000)	50,000,000	(26,000,000)	75,000,000	(3,000,000)	105,000,000	(39,000,000)	(570,000,000)
Net Income (Loss) Attributable to Parent	30,000,000	25,000,000	19,000,000	31,000,000	(36,000,000)	23,000,000	7,000,000	(33,000,000)	50,000,000	(26,000,000)	75,000,000	(3,000,000)	105,000,000	(39,000,000)	(535,000,000)
Net Income (Loss) Allocated to Limited Partners	30,000,000	25,000,000	19,000,000	31,000,000	(36,000,000)	23,000,000	7,000,000	(39,000,000)	50,000,000	(32,000,000)	75,000,000	(9,000,000)	105,000,000	(45,000,000)	(499,000,000)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	31,000,000	25,000,000	19,000,000	31,000,000	(38,000,000)	23,000,000	7,000,000	(34,000,000)	51,000,000	(27,000,000)	76,000,000	(4,000,000)	107,000,000	(42,000,000)	(507,000,000)
Increase (Decrease) in Deferred Income Taxes													31,000,000	(108,000,000)	181,000,000
Increase (Decrease) in Other Operating Assets and Liabilities, Net													(66,000,000)	197,000,000	$ (159,000,000)
Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts Payable, Related Parties, Current	99,000,000	57,000,000	29,000,000	33,000,000	38,000,000	462,000,000	451,000,000	467,000,000	29,000,000	451,000,000	57,000,000	462,000,000	99,000,000	38,000,000
Income Tax Expense (Benefit)	23,000,000	(28,000,000)	25,000,000	12,000,000	18,000,000	8,000,000	14,000,000	106,000,000	37,000,000	120,000,000	9,000,000	128,000,000	32,000,000	146,000,000
Liabilities, Current	273,000,000	238,000,000	207,000,000	198,000,000	237,000,000	687,000,000	726,000,000	776,000,000	207,000,000	726,000,000	238,000,000	687,000,000	273,000,000	237,000,000
Deferred Tax Liabilities, Net, Noncurrent	695,000,000	722,000,000	1,528,000,000	1,511,000,000	1,508,000,000	1,452,000,000	1,461,000,000	1,469,000,000	1,528,000,000	1,461,000,000	722,000,000	1,452,000,000	695,000,000	1,508,000,000
General Partners' Capital Account	2,937,000,000	2,874,000,000	2,951,000,000	2,957,000,000	2,925,000,000	2,925,000,000	2,915,000,000	2,926,000,000	2,951,000,000	2,915,000,000	2,874,000,000	2,925,000,000	2,937,000,000	2,925,000,000
Partners' Capital	2,939,000,000	2,875,000,000	2,952,000,000	2,957,000,000	2,925,000,000	2,927,000,000	2,917,000,000	2,928,000,000	2,952,000,000	2,917,000,000	2,875,000,000	2,927,000,000	2,939,000,000	2,925,000,000
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	24,000,000	76,000,000	(6,000,000)	31,000,000	(7,000,000)	23,000,000	16,000,000	(35,000,000)	25,000,000	(19,000,000)	101,000,000	4,000,000	125,000,000	(3,000,000)
Net Income (Loss) Attributable to Parent	24,000,000	76,000,000	(6,000,000)	31,000,000	(7,000,000)	23,000,000	16,000,000	(35,000,000)	25,000,000	(19,000,000)	101,000,000	4,000,000	125,000,000	(3,000,000)
Net Income (Loss) Allocated to Limited Partners	24,000,000	76,000,000	(6,000,000)	31,000,000	(7,000,000)	23,000,000	16,000,000	(41,000,000)	25,000,000	(25,000,000)	101,000,000	(2,000,000)	125,000,000	(9,000,000)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	25,000,000	76,000,000	(6,000,000)	31,000,000	(9,000,000)	23,000,000	16,000,000	(36,000,000)	26,000,000	(20,000,000)	102,000,000	3,000,000	127,000,000	(6,000,000)
Increase (Decrease) in Deferred Income Taxes													14,000,000	(139,000,000)
Increase (Decrease) in Other Operating Assets and Liabilities, Net													(69,000,000)	192,000,000
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts Payable, Related Parties, Current	26,000,000	6,000,000	5,000,000	6,000,000	5,000,000	1,000,000	1,000,000	0	5,000,000	1,000,000	6,000,000	1,000,000	26,000,000	5,000,000
Income Tax Expense (Benefit)	(6,000,000)	51,000,000	(25,000,000)	0	29,000,000	0	9,000,000	(2,000,000)	(25,000,000)	7,000,000	26,000,000	7,000,000	20,000,000	36,000,000
Liabilities, Current	26,000,000	6,000,000	5,000,000	6,000,000	5,000,000	1,000,000	1,000,000	0	5,000,000	1,000,000	6,000,000	1,000,000	26,000,000	5,000,000
Deferred Tax Liabilities, Net, Noncurrent	30,000,000	57,000,000	6,000,000	31,000,000	31,000,000	6,000,000	6,000,000	(2,000,000)	6,000,000	6,000,000	57,000,000	6,000,000	30,000,000	31,000,000
General Partners' Capital Account	(56,000,000)	(62,000,000)	(11,000,000)	(37,000,000)	(36,000,000)	(7,000,000)	(7,000,000)	2,000,000	(11,000,000)	(7,000,000)	(62,000,000)	(7,000,000)	(56,000,000)	(36,000,000)
Partners' Capital	(56,000,000)	(62,000,000)	(11,000,000)	(37,000,000)	(36,000,000)	(7,000,000)	(7,000,000)	2,000,000	(11,000,000)	(7,000,000)	(62,000,000)	(7,000,000)	(56,000,000)	(36,000,000)
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	6,000,000	(51,000,000)	25,000,000	0	(29,000,000)	0	(9,000,000)	2,000,000	25,000,000	(7,000,000)	(26,000,000)	(7,000,000)	(20,000,000)	(36,000,000)
Net Income (Loss) Attributable to Parent	6,000,000	(51,000,000)	25,000,000	0	(29,000,000)	0	(9,000,000)	2,000,000	25,000,000	(7,000,000)	(26,000,000)	(7,000,000)	(20,000,000)	(36,000,000)
Net Income (Loss) Allocated to Limited Partners	6,000,000	(51,000,000)	25,000,000	0	(29,000,000)	0	(9,000,000)	2,000,000	25,000,000	(7,000,000)	(26,000,000)	(7,000,000)	(20,000,000)	(36,000,000)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 6,000,000	$ (51,000,000)	$ 25,000,000	$ 0	$ (29,000,000)	$ 0	$ (9,000,000)	$ 2,000,000	$ 25,000,000	$ (7,000,000)	$ (26,000,000)	$ (7,000,000)	(20,000,000)	(36,000,000)
Increase (Decrease) in Deferred Income Taxes													17,000,000	31,000,000
Increase (Decrease) in Other Operating Assets and Liabilities, Net													3,000,000	5,000,000
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income Tax Expense (Benefit)													$ 20,000,000	$ 36,000,000