CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 3	$ 30	$ 65	$ 47	$ 32	$ 55	$ 32	$ 74	$ 17	$ 49
Accounts receivable, net	48	41	40	51	58	51	51	55
Accounts receivable from related companies	172	120	54	42	128	30	57	33
Exchanges receivable	5	9	10	12	11	17	45	62
Inventories	113	99	106	83	119	115	147	160
Other current assets	9	15	13	13	10	48	20	15
Total current assets	350	314	288	248	358	316	352	399
Property, plant and equipment
Total property, plant and equipment	3,338	3,456	3,428	3,403	3,395	3,360	3,331	3,316
Accumulated depreciation	(286)	(342)	(319)	(292)	(269)	(243)	(215)	(192)
Net property, plant and equipment	3,052	3,114	3,109	3,111	3,126	3,117	3,116	3,124
Investments in unconsolidated affiliates	15	15	1,404	1,428	1,443	1,480	1,488	1,502
Goodwill	923	923	1,152	1,152	1,152	1,152	1,152	1,152	1,336
NOTE RECEIVABLE FROM RELATED PARTY	574	1,369	40	40	0	386	386	386
OTHER NON-CURRENT ASSETS, net	122	127	116	110	109	106	105	95
Due from Related Parties, Noncurrent	258	0	40	40	0	0	0	0
Total assets	5,294	5,862	6,149	6,129	6,188	6,557	6,599	6,658
Current liabilities:
Current maturities of long-term debt	1	1	1	1	1	1	1	1
Accounts payable and accrued liabilities	3	4	4	2	6	4	5	2
Accounts payable to related companies	125	63	34	39	43	463	452	467
Exchanges payable	94	83	91	76	114	117	179	214
Accrued interest	12	24	12	24	12	24	12	24
Customer Advances and Deposits, Current	9	9	11	8	10	13	21	16
Other current liabilities	55	60	59	54	56	66	57	52
Total current liabilities	299	244	212	204	242	688	727	776
Long-term debt, less current maturities	1,165	1,172	1,178	1,184	1,189	1,195	1,201	1,203
Deferred income taxes	725	779	1,534	1,542	1,539	1,458	1,467	1,467
ADVANCES FROM AFFILIATES	0	566	0	0	51	0	0	0
Other non-current liabilities	222	289	284	279	278	296	294	282
Commitments and contingencies
Partners’ capital:
Partners’ capital	2,881	2,812	2,940	2,920	2,889	2,918	2,908	2,928
Accumulated other comprehensive income	2	1	1	0	0	2	2	2
Total partners’ capital	2,883	2,813	2,941	2,920	2,889	2,920	2,910	2,930	$ 3,068	$ 4,028
Total liabilities and partners’ capital	$ 5,294	$ 5,862	$ 6,149	$ 6,129	$ 6,188	$ 6,557	$ 6,599	$ 6,658