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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 906 $ 1,386 $ 1,391
Reconciliation of net income to net cash provided by operating activities:      
Depreciation and amortization 432 384 365
Equity-indexed compensation expense 27 98 116
Inventory valuation adjustments 117 289 7
Deferred income tax expense/(benefit) 16 100 (1)
Settlement of terminated interest rate hedging instruments (48) (7) 8
Equity earnings in unconsolidated entities (183) (108) (64)
Distributions from unconsolidated entities 214 105 54
Other (21) 24 4
Changes in assets and liabilities, net of acquisitions:      
Trade accounts receivable and other 803 1,177 (186)
Inventory (90) (129) 134
Accounts payable and other current liabilities (829) (1,315) 126
Net cash provided by operating activities 1,344 2,004 1,954
CASH FLOWS FROM INVESTING ACTIVITIES      
Cash paid in connection with acquisitions, net of cash acquired (Note 7) (105) (1,098) (28)
Investments in unconsolidated entities (Note 7) (253) (158) (133)
Additions to property, equipment and other (2,079) (1,932) (1,613)
Cash paid for purchases of linefill and base gas (133) (161) (122)
Proceeds from sales of assets 5 28 200
Other investing activities 35 25 43
Net cash used in investing activities (2,530) (3,296) (1,653)
CASH FLOWS FROM FINANCING ACTIVITIES      
Net borrowings/(repayments) under senior secured hedged inventory facility (Note 9) 300   (660)
Net repayments under senior unsecured revolving credit facility (Note 9)     (92)
Net repayments under PNG credit agreement     (382)
Net borrowings/(repayments) under commercial paper program (Note 9) 631 (366) 1,110
Proceeds from the issuance of senior notes (Note 9) 998 2,595 699
Repayments of senior notes (Note 9) (549)   (250)
Net proceeds from the sale of common units (Note 10) 1,099 848 465
Contributions from general partner 23 18 25
Distributions paid to common unitholders (Note 10) (1,081) (934) (791)
Distributions paid to general partner (Note 10) (590) (473) (369)
Other financing activities (17) (31) (36)
Net cash provided by/(used in) financing activities 814 1,657 (281)
Effect of translation adjustment on cash (4) (3) (3)
Net increase/(decrease) in cash and cash equivalents (376) 362 17
Cash and cash equivalents, beginning of period 403 41 24
Cash and cash equivalents, end of period 27 403 41
Cash paid for:      
Interest, net of amounts capitalized 396 334 305
Income taxes, net of amounts refunded $ 50 $ 159 $ 37