Supplemental Financial Statement Information Table - Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Cash and cash equivalents	$ 1,010	$ 590	$ 614	$ 372
Accounts receivable from related companies	40	63
Other current assets	279	312
Total current assets	7,516	6,536
ADVANCES TO AND INVESTMENTS IN UNCONSOLIDATED AFFILIATES	3,818	4,014
INTANGIBLE ASSETS, net	5,132	2,264
GOODWILL	6,216	5,894
OTHER NON-CURRENT ASSETS, net	971	922
Total assets	57,769	50,330
Accounts payable	4,272	3,834
Accounts payable to related companies	10	14
Interest payable	411	357
Price risk management liabilities	70	53
Accrued and other current liabilities	1,958	1,678
Current maturities of long-term debt	1,388	637
Total current liabilities	8,091	6,500
LONG-TERM DEBT, less current maturities	24,905	22,562
PREFERRED UNITS OF SUBSIDIARY	32	32
OTHER NON-CURRENT LIABILITIES	1,024	1,019
COMMITMENTS AND CONTINGENCIES
General Partner	(1)	(3)
Limited Partners	1,271	1,066
Class D Units	10	6
Accumulated other comprehensive income	6	9
Total partners’ capital	1,286	1,078
Total liabilities and equity	57,769	50,330
Parent Company [Member]
Cash and cash equivalents	16	8	42	9
Accounts receivable from related companies	6	5
Other current assets	1	0
Total current assets	23	13
ADVANCES TO AND INVESTMENTS IN UNCONSOLIDATED AFFILIATES	4,448	3,841
INTANGIBLE ASSETS, net	13	14
GOODWILL	9	9
OTHER NON-CURRENT ASSETS, net	41	41
Total assets	4,534	3,918
Accounts payable to related companies	42	11
Interest payable	53	24
Accrued and other current liabilities	2	3
Total current liabilities	97	38
LONG-TERM DEBT, less current maturities	3,150	2,801
OTHER NON-CURRENT LIABILITIES	1	1
COMMITMENTS AND CONTINGENCIES
General Partner	(1)	(3)
Limited Partners	1,271	1,066
Class D Units	10	6
Accumulated other comprehensive income	6	9
Total partners’ capital	1,286	1,078
Total liabilities and equity	$ 4,534	$ 3,918