UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net income	$ 755.3	$ 655.5
Reconciliation of net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	292.0	266.1
Non-cash asset impairment charges (see Note 4)	11.0	5.4
Equity in income of unconsolidated affiliates	(44.5)	(9.9)
Distributions received from unconsolidated affiliates	51.3	27.0
Gains attributable to asset sales and insurance recoveries (see Note 16)	(63.9)	(55.8)
Deferred income tax benefit	(6.5)	(67.2)
Changes in fair market value of derivative instruments	12.3	(15.4)
Net effect of changes in operating accounts (see Note 16)	(8.0)	(201.1)
Other operating activities	0.9	0.3
Net cash flows provided by operating activities	999.9	604.9
Investing activities:
Capital expenditures	(631.6)	(973.1)
Contributions in aid of construction costs	8.7	5.0
Increase in restricted cash	(63.8)	(15.0)
Investments in unconsolidated affiliates	(291.4)	(50.6)
Proceeds from asset sales and insurance recoveries (see Note 16)	130.5	998.2
Other investing activities	0.4	0
Cash used in investing activities	(847.2)	(35.5)
Financing activities:
Borrowings under debt agreements	6,174.6	1,396.6
Repayments of debt	(4,826.6)	(1,300.0)
Debt issuance costs	(17.3)	(7.1)
Monetization of interest rate derivative instruments (see Note 4)	(168.8)	(77.6)
Cash distributions paid to limited partners (see Note 10)	(577.6)	(530.4)
Cash distributions paid to noncontrolling interests (see Note 10)	(2.4)	(6.6)
Cash contributions from noncontrolling interests (see Note 10)	0	4.9
Net cash proceeds from issuance of common units	554.1	32.8
Other financing activities	(24.5)	(13.5)
Cash provided by (used in) financing activities	1,111.5	(500.9)
Net change in cash and cash equivalents	1,264.2	68.5
Cash and cash equivalents, January 1	16.1	19.8
Cash and cash equivalents, March 31	$ 1,280.3	$ 88.3