UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net income	$ 1,598.7	$ 1,437.0
Reconciliation of net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	889.3	808.8
Asset impairment and related charges	16.8	25.2
Equity in income of unconsolidated affiliates	(238.0)	(201.8)
Distributions received on earnings from unconsolidated affiliates	227.6	205.1
Net gains attributable to asset sales	(1.4)	0.0
Deferred income tax expense	10.0	0.7
Change in fair market value of derivative instruments	459.0	(43.9)
Change in fair market value of Liquidity Option Agreement	16.4	24.1
Gain on step acquisition of unconsolidated affiliate	(39.4)	0.0
Net effect of changes in operating accounts	(228.5)	82.1
Other operating activities	(12.7)	(2.4)
Net cash flows provided by operating activities	2,697.8	2,334.9
Investing activities:
Capital expenditures	(1,921.1)	(1,113.1)
Cash used for business combinations, net of cash received	(149.7)	(191.4)
Investments in unconsolidated affiliates	(45.9)	(24.1)
Distributions received for return of capital from unconsolidated affiliates	25.9	24.8
Proceeds from asset sales	2.6	3.2
Other investing activities	(1.4)	2.0
Cash used in investing activities	(2,089.6)	(1,298.6)
Financing activities:
Borrowings under debt agreements	38,566.4	33,307.8
Repayments of debt	(37,437.0)	(33,639.3)
Debt issuance costs	(24.3)	0.0
Cash distributions paid to limited partners	(1,847.3)	(1,757.8)
Cash payments made in connection with distribution equivalent rights	(8.6)	(7.2)
Cash distributions paid to noncontrolling interests	(28.3)	(23.1)
Cash contributions from noncontrolling interests	206.9	0.3
Net cash proceeds from the issuance of common units	261.0	757.2
Other financing activities	(25.8)	(27.8)
Cash provided by (used in) financing activities	(337.0)	(1,389.9)
Net change in cash and cash equivalents, including restricted cash	271.2	(353.6)
Cash and cash equivalents, including restricted cash, at beginning of period	70.3	417.6
Cash and cash equivalents, including restricted cash, at end of period	$ 341.5	$ 64.0