UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating activities:
Net income	$ 655.5	$ 434.5
Reconciliation of net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	266.1	241.1
Non-cash asset impairment charges	5.4	0
Equity in income of unconsolidated affiliates	(9.9)	(16.2)
Distributions received from unconsolidated affiliates	27.0	42.5
Gains from asset sales and related transactions	(55.2)	(18.4)
Deferred income tax expense (benefit)	(67.2)	0.8
Changes in fair market value of derivative instruments	(15.4)	(1.3)
Net effect of changes in operating accounts (see Note 15)	(201.1)	120.0
Other operating activities	(0.3)	(0.3)
Net cash flows provided by operating activities	604.9	802.7
Investing activities:
Capital expenditures	(973.1)	(713.5)
Contributions in aid of construction costs	5.0	3.2
Increase in restricted cash	(15.0)	(92.9)
Investments in unconsolidated affiliates	(50.6)	(3.8)
Proceeds from asset sales (see Note 15)	998.2	84.2
Other investing activities	0	(3.6)
Cash used in investing activities	(35.5)	(726.4)
Financing activities:
Borrowings under debt agreements	1,396.6	2,821.6
Repayments of debt	(1,300)	(2,316)
Debt issuance costs	(7.1)	(12.8)
Monetization of interest rate derivative instruments (see Note 4)	(77.6)	(5.7)
Cash distributions paid to limited partners (see Note 10)	(530.4)	(479.7)
Cash distributions paid to noncontrolling interests (see Note 10)	(6.6)	(17.2)
Cash contributions from noncontrolling interests (see Note 10)	4.9	1.3
Net cash proceeds from issuance of common units	29.0	21.0
Other financing activities	(9.7)	(3.9)
Cash provided by (used in) financing activities	(500.9)	8.6
Net change in cash and cash equivalents	68.5	84.9
Cash and cash equivalents, January 1	19.8	65.5
Cash and cash equivalents, March 31	$ 88.3	$ 150.4