Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES:
Net (loss) income	$ (3)	$ 12
Reconciliation of net (loss) income to net cash flows provided by operating activities:
Depreciation, depletion and amortization, including debt issuance cost amortization and bond premium write-off and amortization	158	97
Income from unconsolidated affiliates	(50)	(43)
Derivative valuation changes	9	17
Gain on asset sales, net	0	(2)
Unit-based compensation expenses	4	2
Cash flow changes in current assets and liabilities:
Trade accounts receivable and related party receivables	64	(21)
Other current assets and other current liabilities	35	35
Trade accounts payable and related party payables	(149)	48
Distributions of earnings received from unconsolidated affiliates	52	43
Cash flow changes in other assets and liabilities	2	(1)
Net cash flows provided by operating activities	122	187
INVESTING ACTIVITIES:
Capital expenditures	(457)	(215)
Capital contributions to unconsolidated affiliates	(90)	(40)
Distributions in excess of earnings of unconsolidated affiliates	21	9
Acquisitions, net of cash received	0	(213)
Proceeds from asset sales	3	5
Net cash flows used in investing activities	(523)	(454)
FINANCING ACTIVITIES:
Borrowings (repayments) under revolving credit facility, net	583	(519)
Proceeds from issuances of senior notes	0	886
Debt issuance costs	(1)	(16)
Drafts payable	8	(8)
Partner distributions and distributions on unvested unit awards	(218)	(107)
Common units issued under unit offerings, equity distribution program and LTIP, net of issuance costs, forfeitures and tax withholding	34	34
Distributions to Series A Preferred Units	(1)	(1)
Noncontrolling interest contributions (distributions), net	31	(8)
Net cash flows provided by financing activities	436	261
Net change in cash and cash equivalents	35	(6)
Cash and cash equivalents at beginning of period	24	19
Cash and cash equivalents at end of period	59	13
Supplemental cash flow information:
Accrued capital expenditures	80	24
Interest paid, net of amounts capitalized	64	29
Issuance of common units in connection with PVR and Hoover acquisitions	0	4,015
Long-term debt assumed in PVR Acquisition	$ 0	$ 1,887