UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net income	$ 1,437.0	$ 1,240.2
Reconciliation of net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	808.8	763.4
Asset impairment and related charges	25.2	22.3
Equity in income of unconsolidated affiliates	(201.8)	(177.5)
Distributions received on earnings from unconsolidated affiliates	205.1	195.1
Net losses attributable to asset sales	0.0	6.6
Deferred income tax expense	0.7	4.3
Change in fair market value of derivative instruments	(43.9)	68.3
Change in fair market value of Liquidity Option Agreement	24.1	21.1
Net effect of changes in operating accounts	82.1	(294.6)
Other operating activities	(2.4)	(4.0)
Net cash flows provided by operating activities	2,334.9	1,845.2
Investing activities:
Capital expenditures	(1,142.7)	(1,880.4)
Contributions in aid of construction costs	29.6	23.6
Decrease (increase) in restricted cash	319.1	(356.7)
Cash used for Azure acquisition	(191.4)	0.0
Investments in unconsolidated affiliates	(24.1)	(92.4)
Distributions received for return of capital from unconsolidated affiliates	24.8	39.4
Proceeds from asset sales	3.2	27.9
Other investing activities	2.0	0.0
Cash used in investing activities	(979.5)	(2,238.6)
Financing activities:
Borrowings under debt agreements	33,307.8	33,235.3
Repayments of debt	(33,639.3)	(32,986.7)
Debt issuance costs	0.0	(9.7)
Cash distributions paid to limited partners	(1,757.8)	(1,610.5)
Cash payments made in connection with distribution equivalent rights	(7.2)	(5.3)
Cash distributions paid to noncontrolling interests	(23.1)	(20.8)
Cash contributions from noncontrolling interests	0.3	16.0
Net cash proceeds from the issuance of common units	757.2	1,888.3
Other financing activities	(27.8)	(18.7)
Cash provided by (used in) financing activities	(1,389.9)	487.9
Net change in cash and cash equivalents	(34.5)	94.5
Cash and cash equivalents, beginning balance	63.1	19.0
Cash and cash equivalents, ending balance	$ 28.6	$ 113.5