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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 304 $ 408
Reconciliation of net income to net cash provided by operating activities:    
Depreciation and amortization 319 212
Equity-indexed compensation expense 26 36
Inventory valuation adjustments 3 24
Deferred income tax benefit (27) (12)
Gain on foreign currency revaluation (2) (26)
Settlement of terminated interest rate hedging instruments (50) (29)
Change in fair value of Preferred Distribution Rate Reset Option (Note 9) (25)  
Equity earnings in unconsolidated entities (87) (89)
Distributions from unconsolidated entities 101 102
Other 6 (6)
Changes in assets and liabilities, net of acquisitions (181) 40
Net cash provided by operating activities 387 660
CASH FLOWS FROM INVESTING ACTIVITIES    
Cash paid in connection with acquisitions (85) (64)
Investments in unconsolidated entities (120) (119)
Additions to property, equipment and other (699) (1,031)
Cash paid for purchases of linefill and base gas (7) (125)
Proceeds from sales of assets 391 2
Other investing activities (2) (6)
Net cash used in investing activities (522) (1,343)
CASH FLOWS FROM FINANCING ACTIVITIES    
Net borrowings/(repayments) under commercial paper program (Note 7) (844) 151
Net borrowings under senior secured hedged inventory facility (Note 7) 252  
Repayments of senior notes   (149)
Net proceeds from the sale of Series A preferred units (Note 8) 1,569  
Net proceeds from the sale of common units   1,099
Contributions from general partner 33 23
Distributions paid to common unitholders (Note 8) (557) (526)
Distributions paid to general partner (Note 8) (309) (284)
Other financing activities (6) (5)
Net cash provided by financing activities 138 309
Effect of translation adjustment on cash 4 (1)
Net increase/(decrease) in cash and cash equivalents 7 (375)
Cash and cash equivalents, beginning of period 27 403
Cash and cash equivalents, end of period 34 28
Cash paid for:    
Interest, net of amounts capitalized 225 190
Income taxes, net of amounts refunded $ 51 $ 30