Supplemental Financial Statement Information Schedule Of Statements of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
NET CASH FLOWS PROVIDED BY OPERATING ACTIVITIES	$ 829	$ 330
Net cash used in investing activities	(801)	(700)
Proceeds received in (paid for) acquisitions and other transactions, net	(214)	0
Proceeds from borrowings	3,170	2,899
Repayments of long-term debt	(1,977)	(1,961)
Distributions to partners	195	179
Units repurchased	366	0
Debt issuance costs	(17)	(16)
Net cash used in financing activities	392	612
INCREASE IN CASH AND CASH EQUIVALENTS	420	242
CASH AND CASH EQUIVALENTS, beginning of period	590	372
CASH AND CASH EQUIVALENTS, end of period	1,010	614
Parent Company [Member]
NET CASH FLOWS PROVIDED BY OPERATING ACTIVITIES	229	182
Net cash used in investing activities	(7)	0
Contributions to unconsolidated affiliate	(7)	0
Proceeds from borrowings	405	95
Repayments of long-term debt	(56)	(65)
Distributions to partners	(195)	(179)
Units repurchased	(366)	0
Debt issuance costs	(2)	0
Net cash used in financing activities	(214)	(149)
INCREASE IN CASH AND CASH EQUIVALENTS	8	33
CASH AND CASH EQUIVALENTS, beginning of period	8	9
CASH AND CASH EQUIVALENTS, end of period	$ 16	$ 42