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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 1,418 $ 388
Reconciliation of net income to net cash provided by operating activities:    
Depreciation and amortization 283 256
(Gains)/losses on asset sales and asset impairments, net   (81)
Equity-indexed compensation expense 24 36
Deferred income tax expense/(benefit) (52) 25
Settlement of terminated interest rate hedging instruments (22) 14
Equity earnings in unconsolidated entities (172) (171)
Distributions on earnings from unconsolidated entities 200 206
Gain on investment in unconsolidated entities (Note 7) (267)  
Other 8 13
Changes in assets and liabilities, net of acquisitions 44 329
Net cash provided by operating activities 1,464 1,015
CASH FLOWS FROM INVESTING ACTIVITIES    
Cash paid in connection with acquisitions, net of cash acquired (47)  
Investments in unconsolidated entities (259) (216)
Additions to property, equipment and other (642) (724)
Proceeds from sales of assets 2 426
Cash paid for purchases of linefill and base gas (24)  
Other investing activities (8) 8
Net cash used in investing activities (978) (506)
CASH FLOWS FROM FINANCING ACTIVITIES    
Net borrowings under commercial paper program (Note 8) 218 135
Net borrowings under senior unsecured revolving credit facility (Note 8)   126
Net borrowings/(repayments) under senior secured hedged inventory facility (Note 8) 100 (333)
Sale of noncontrolling interest in a subsidiary (Note 9) 128  
Other financing activities 45 60
Net cash used in financing activities (88) (509)
Effect of translation adjustment (3) (3)
Net increase/(decrease) in cash and cash equivalents and restricted cash 395 (3)
Cash and cash equivalents and restricted cash, beginning of period 66 37
Cash and cash equivalents and restricted cash, end of period 461 34
Cash paid for:    
Interest, net of amounts capitalized 188 203
Income taxes, net of amounts refunded 86 11
Series A Preferred Units    
CASH FLOWS FROM FINANCING ACTIVITIES    
Distributions paid to unitholders (Note 9) (74) (37)
Series B Preferred Units    
CASH FLOWS FROM FINANCING ACTIVITIES    
Distributions paid to unitholders (Note 9) (25) (25)
Common Units    
CASH FLOWS FROM FINANCING ACTIVITIES    
Distributions paid to unitholders (Note 9) $ (480) $ (435)