Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
OPERATING ACTIVITIES:
Net income (loss)	$ 12	$ (29)
Reconciliation of net income (loss) to net cash flows provided by operating activities:
Depreciation, depletion and amortization, including debt issuance cost amortization and bond premium write-off and amortization	97	67
Income from unconsolidated affiliates	(43)	(35)
Derivative valuation changes	17	18
(Gain) loss on asset sales, net	(2)	1
Unit-based compensation expenses	2	2
Cash flow changes in current assets and liabilities:
Trade accounts receivable and related party receivables	(21)	(14)
Other current assets and other current liabilities	35	85
Trade accounts payable and related party payables	48	(47)
Distributions of earnings received from unconsolidated affiliates	43	36
Cash flow changes in other assets and liabilities	(1)	(1)
Net cash flows provided by operating activities	187	83
INVESTING ACTIVITIES:
Capital expenditures	(215)	(273)
Capital contributions to unconsolidated affiliates	(40)	(43)
Distributions in excess of earnings of unconsolidated affiliates	9	16
Acquisitions, net of cash received	(213)	0
Proceeds from asset sales	5	12
Net cash flows used in investing activities	(454)	(288)
FINANCING ACTIVITIES:
(Repayments) borrowings under revolving credit facility, net	(519)	179
Proceeds from issuances of senior notes	886	0
Debt issuance costs	(16)	0
Drafts payable	(8)	5
Partner distributions and distributions on unvested unit awards	(107)	(83)
Common units issued under equity distribution program, net of costs	34	0
Distributions to Series A preferred units	(1)	(2)
Noncontrolling interest (distributions) contributions	(8)	11
Contributions from previous parent	0	86
Net cash flows provided by financing activities	261	196
Net change in cash and cash equivalents	(6)	(9)
Cash and cash equivalents at beginning of period	19	53
Cash and cash equivalents at end of period	13	44
Supplemental cash flow information:
Accrued capital expenditures	24	62
Interest paid, net of amounts capitalized	29	18
Issuance of common units in connection with PVR and Hoover Acquisitions	4,015	0
Accrued capital contribution to unconsolidated affiliate	0	8
Long-term debt assumed in PVR Acquisition	$ 1,887	$ 0