Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
OPERATING ACTIVITIES:
Net income	$ 115	$ 24
Reconciliation of net 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	363	211
Income from unconsolidated affiliates	(143)	(103)
Derivative valuation changes	(3)	3
Loss (gain) on asset sales, net	(1)	1
Unit-based compensation expenses	8	5
Cash flow changes in current assets and liabilities:
Trade accounts receivable and related party receivables	(45)	(73)
Other current assets and other current liabilities	52	(26)
Trade accounts payable and related party payables	73	103
Distributions of earnings received from unconsolidated affiliates	147	108
Cash flow changes in other assets and liabilities	4	128
Net cash flows provided by operating activities	570	381
INVESTING ACTIVITIES:
Capital expenditures	(764)	(762)
Capital contributions to unconsolidated affiliates	(274)	(125)
Distributions in excess of earnings of unconsolidated affiliates	47	232
Acquisitions, net of cash received	(790)	(463)
Proceeds from asset sales	7	13
Net cash flows used in investing activities	(1,774)	(1,105)
FINANCING ACTIVITIES:
Repayments under revolving credit facility, net	(436)	(15)
Proceeds from issuances of senior notes	1,600	1,000
Redemptions of senior notes	(403)	(163)
Debt issuance costs	(29)	(24)
Drafts payable	(3)	8
Partner distributions and distributions on unvested unit awards	(492)	(282)
Common unit offering, net of issuance costs	800	0
Common units issued under equity distribution program, net of costs	162	149
Distributions to Series A Preferred Units	(3)	(5)
Noncontrolling interest contributions, net of distributions	4	15
Net cash flows provided by financing activities	1,200	683
Net change in cash and cash equivalents	(4)	(41)
Cash and cash equivalents at beginning of period	19	53
Cash and cash equivalents at end of period	15	12
Supplemental cash flow information:
Accrued capital expenditures	61	70
Issuance of Class F and common units in connection with SUGS Acquisition	0	961
Interest paid, net of amounts capitalized	196	0
Issuance of common units in connection with PVR, Hoover and Eagle Rock acquisitions	4,281	0
Long-term debt assumed in PVR Acquisition	1,887	0
Long-term debt exchanged in connection with the Eagle Rock Midstream Acquisition	$ 499	$ 0