UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating activities:
Net income	$ 1,901.4	$ 1,810.6
Reconciliation of net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	902.3	817.9
Non-cash asset impairment charges	53.3	57.6
Equity in income of unconsolidated affiliates	(126.1)	(42.2)
Distributions received from unconsolidated affiliates	187.6	67.5
Gains attributable to asset sales and insurance recoveries (see Note 16)	(68.4)	(102.9)
Deferred income tax expense (benefit)	32.1	(67.9)
Changes in fair market value of derivative instruments	(5.3)	(15.9)
Net effect of changes in operating accounts (see Note 16)	(513.9)	(910.2)
Other operating activities	3.2	1.3
Net cash flows provided by operating activities	2,366.2	1,615.8
Investing activities:
Capital expenditures	(2,413.2)	(2,716.1)
Contributions in aid of construction costs	19.9	18.2
Decrease (increase) in restricted cash	(31.6)	19.7
Investments in unconsolidated affiliates	(768.4)	(351.8)
Proceeds from asset sales and insurance recoveries (see Note 16)	256.3	1,167.4
Other investing activities	(0.5)	(32.4)
Cash used in investing activities	(2,937.5)	(1,895.0)
Financing activities:
Borrowings under debt agreements	10,139.2	7,141.4
Repayments of debt	(8,791.6)	(5,716.0)
Debt issuance costs	(23.7)	(20.7)
Monetization of interest rate derivative instruments (see Note 4)	(168.8)	(147.8)
Cash distributions paid to limited partners (see Note 10)	(1,778.3)	(1,613.4)
Cash distributions paid to noncontrolling interests	(6.4)	(11.3)
Cash contributions from noncontrolling interests (see Note 10)	104.2	6.5
Net cash proceeds from issuance of common units	1,134.7	658.6
Acquisition of treasury units	(36.1)	(19.6)
Other financing activities	(8.4)	(3.8)
Cash provided by (used in) financing activities	564.8	273.9
Net change in cash and cash equivalents	(6.5)	(5.3)
Cash and cash equivalents, January 1	16.1	19.8
Cash and cash equivalents, September 30	$ 9.6	$ 14.5