Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
OPERATING ACTIVITIES:
Net income (loss)	$ 8	$ (18)
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	264	137
Income from unconsolidated affiliates	(90)	(66)
Derivative valuation changes	13	17
Loss (gain) on asset sales, net	(2)	2
Unit-based compensation expenses	5	3
Cash flow changes in current assets and liabilities:
Trade accounts receivable and related party receivables	(17)	(41)
Other current assets and other current liabilities	26	(51)
Trade accounts payable and related party payables	(36)	10
Distributions of earnings received from unconsolidated affiliates	96	71
Cash flow changes in other assets and liabilities	10	131
Net cash flows provided by operating activities	277	195
INVESTING ACTIVITIES:
Capital expenditures	(401)	(472)
Capital contributions to unconsolidated affiliates	(83)	(72)
Distributions in excess of earnings of unconsolidated affiliates	20	37
Acquisitions, net of cash received	(212)	(463)
Proceeds from asset sales	6	12
Net cash flows used in investing activities	(670)	(958)
FINANCING ACTIVITIES:
(Repayments) borrowings under revolving credit facility, net	(275)	343
Proceeds from issuances of senior notes	884	600
Redemptions of senior notes	(313)	(163)
Debt issuance costs	(22)	(17)
Drafts payable	(25)	7
Partner distributions and distributions on unvested unit awards	(286)	(179)
Common unit offering, net of issuance costs	400	128
Common units issued under equity distribution program, net of costs	65	0
Distributions to Series A Preferred Units	(2)	(4)
Noncontrolling interest (distributions) contributions	(2)	12
Net cash flows provided by financing activities	424	727
Net change in cash and cash equivalents	31	(36)
Cash and cash equivalents at beginning of period	19	53
Cash and cash equivalents at end of period	50	17
Supplemental cash flow information:
Accrued capital expenditures	48	133
Accrued capital contribution to unconsolidated affiliates	175	22
Issuance of Class F and common units in connection with SUGS Acquisition	0	1,223
Interest paid, net of amounts capitalized	134	0
Issuance of common units in connection with PVR and Hoover acquisitions	4,015	0
Long-term debt assumed in PVR Acquisition	$ 1,887	$ 0