STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities:
Net income	$ 3,885.7	$ 4,687.1	$ 4,238.5
Reconciliation of net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	2,071.9	1,949.3	1,791.6
Impairment of goodwill	296.3	0.0	0.0
Impairment of assets other than goodwill	594.3	132.8	50.5
Equity in income of unconsolidated affiliates	(426.1)	(563.0)	(480.0)
Distributions received from unconsolidated affiliates attributable to earnings	426.6	568.0	479.4
Net gains attributable to asset sales	(4.4)	(5.7)	(28.7)
Deferred income tax expense (benefit)	(147.6)	20.0	21.4
Change in fair market value of derivative instruments	(79.3)	27.2	17.8
Change in fair market value of Liquidity Option	2.3	119.6	56.1
Gain on step acquisition of unconsolidated affiliate	0.0	0.0	(39.4)
Non-cash expense related to long-term operating leases	39.0	42.8	0.0
Net effect of changes in operating accounts	(767.5)	(457.4)	16.2
Other operating activities	0.3	(0.2)	2.9
Net cash flows provided by operating activities	5,891.5	6,520.5	6,126.3
Investing activities:
Capital expenditures	(3,287.9)	(4,531.7)	(4,223.2)
Cash used for business combinations, net of cash received	0.0	0.0	(150.6)
Investments in unconsolidated affiliates	(15.6)	(111.6)	(113.6)
Distributions received from unconsolidated affiliates attributable to the return of capital	187.5	63.3	50.0
Proceeds from asset sales	12.8	20.6	161.2
Other investing activities	(17.5)	(16.1)	(5.4)
Cash used in investing activities	(3,120.7)	(4,575.5)	(4,281.6)
Financing activities:
Borrowings under debt agreements	6,672.1	58,172.6	79,588.7
Repayments of debt	(4,406.6)	(56,716.5)	(77,957.1)
Debt issuance costs	(46.3)	(27.6)	(49.1)
Monetization of interest rate derivative instruments	(33.3)	0.0	22.1
Cash distributions paid to common unitholders	(3,891.0)	(3,839.8)	(3,726.9)
Cash payments made in connection with distribution equivalent rights	(27.1)	(22.1)	(17.7)
Cash distributions paid to noncontrolling interests	(131.3)	(106.2)	(81.6)
Cash contributions from noncontrolling interests	30.9	632.8	238.1
Net cash proceeds from the issuance of common units	0.0	82.2	538.4
Repurchase of common units under buyback programs	(186.3)	(81.1)	(30.8)
Net cash proceeds from the issuance of preferred units	31.5	0.0	0.0
Other financing activities	(35.3)	(39.4)	(29.0)
Cash used in financing activities	(2,022.7)	(1,945.1)	(1,504.9)
Net change in cash and cash equivalents, including restricted cash	748.1	(0.1)	339.8
Cash and cash equivalents, including restricted cash, at beginning of period	410.0	410.1	70.3
Cash and cash equivalents, including restricted cash, at end of period	$ 1,158.1	$ 410.0	$ 410.1