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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating activities:    
Net income $ 2,058.3 $ 1,883.3
Reconciliation of net income to net cash flows provided by operating activities:    
Depreciation, amortization and accretion 1,221.4 1,155.3
Asset impairment and related charges 35.2 29.1
Equity in income of unconsolidated affiliates (315.2) (269.8)
Distributions received on earnings from unconsolidated affiliates 316.2 281.6
Net gains attributable to asset sales (1.1) (2.3)
Deferred income tax expense 1.1 5.3
Change in fair market value of derivative instruments (14.2) 42.1
Change in fair market value of Liquidity Option Agreement 33.0 28.0
Net effect of changes in operating accounts (512.1) (489.7)
Other operating activities (2.7) (3.9)
Net cash flows provided by operating activities 2,819.9 2,659.0
Investing activities:    
Capital expenditures (2,154.4) (2,443.9)
Contributions in aid of construction costs 36.2 34.1
Decrease (increase) in restricted cash 287.7 (261.4)
Cash used for business combinations, net of cash received (198.7) (1,000.0)
Investments in unconsolidated affiliates (32.8) (119.9)
Distributions received for return of capital from unconsolidated affiliates 36.8 51.9
Proceeds from asset sales 6.2 43.9
Other investing activities 2.8 (0.4)
Cash used in investing activities (2,016.2) (3,695.7)
Financing activities:    
Borrowings under debt agreements 53,150.4 50,183.8
Repayments of debt (52,133.2) (48,776.5)
Debt issuance costs (24.0) (10.5)
Monetization of interest rate derivative instruments 30.6 0.0
Cash distributions paid to limited partners (2,660.4) (2,448.3)
Cash payments made in connection with distribution equivalent rights (11.2) (8.5)
Cash distributions paid to noncontrolling interests (35.4) (35.7)
Cash contributions from noncontrolling interests 0.4 20.1
Net cash proceeds from the issuance of common units 877.2 2,170.4
Other financing activities (28.3) (20.0)
Cash provided by (used in) financing activities (833.9) 1,074.8
Net change in cash and cash equivalents (30.2) 38.1
Cash and cash equivalents, beginning balance 63.1 19.0
Cash and cash equivalents, ending balance $ 32.9 $ 57.1