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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 203 $ 284
Reconciliation of net income to net cash provided by operating activities:    
Depreciation and amortization 114 104
Equity-indexed compensation expense 4 19
Inventory valuation adjustments 3 24
Deferred income tax benefit (12) (26)
Gain on foreign currency revaluation (3) (27)
Equity earnings in unconsolidated entities (47) (37)
Distributions from unconsolidated entities 52 54
Other 3 (6)
Changes in assets and liabilities, net of acquisitions 318 343
Net cash provided by operating activities 635 732
CASH FLOWS FROM INVESTING ACTIVITIES    
Cash paid in connection with acquisitions (85) (64)
Investments in unconsolidated entities (75) (65)
Additions to property, equipment and other (372) (441)
Cash paid for purchases of linefill and base gas   (96)
Proceeds from sales of assets 246 1
Other investing activities (1) (1)
Net cash used in investing activities (287) (666)
CASH FLOWS FROM FINANCING ACTIVITIES    
Net repayments under commercial paper program (Note 6) (1,211) (734)
Net repayments under senior secured hedged inventory facility (Note 6) (300)  
Net proceeds from the sale of Series A preferred units and associated embedded derivative (Note 7) 1,570  
Net proceeds from the sale of common units   1,099
Contributions from general partner 33 22
Distributions paid to common unitholders (Note 7) (278) (254)
Distributions paid to general partner (Note 7) (155) (136)
Other financing activities (2) (3)
Net cash used in financing activities (343) (6)
Effect of translation adjustment on cash 4 (5)
Net increase in cash and cash equivalents 9 55
Cash and cash equivalents, beginning of period 27 403
Cash and cash equivalents, end of period 36 458
Cash paid for:    
Interest, net of amounts capitalized 85 74
Income taxes, net of amounts refunded $ 16 $ 11