CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 388	$ 633
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	175	250
Equity-indexed compensation expense	36	22
Inventory valuation adjustments		35
Deferred income tax expense	25	65
Settlement of terminated interest rate hedging instruments	14	(29)
Equity earnings in unconsolidated entities	(171)	(121)
Distributions on earnings from unconsolidated entities	206	136
Other	13	5
Changes in assets and liabilities, net of acquisitions	329	465
Net cash provided by operating activities	1,015	1,461
CASH FLOWS FROM INVESTING ACTIVITIES
Cash paid in connection with acquisitions, net of cash acquired		(1,281)
Investments in unconsolidated entities	(216)	(250)
Additions to property, equipment and other	(724)	(549)
Proceeds from sales of assets	426	389
Return of investment from unconsolidated entities	9	21
Other investing activities	(1)	16
Net cash used in investing activities	(506)	(1,654)
CASH FLOWS FROM FINANCING ACTIVITIES
Net borrowings under commercial paper program (Note 9)	135	25
Net borrowings under senior unsecured revolving credit facility (Note 9)	126
Net repayments under senior secured hedged inventory facility (Note 9)	(333)	(450)
Repayments of senior notes		(400)
Net proceeds from sales of common units		1,664
Other financing activities	60	123
Net cash provided by/(used in) financing activities	(509)	192
Effect of translation adjustment on cash	(3)	1
Net decrease in cash and cash equivalents	(3)
Cash and cash equivalents, beginning of period	37	47
Cash and cash equivalents, end of period	34	47
Cash paid for:
Interest, net of amounts capitalized	203	252
Income taxes, net of amounts refunded	11	34
Series A Preferred Units
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions paid to unitholders (Note 10)	(37)
Series B Preferred Units
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions paid to unitholders (Note 10)	(25)
Common Units
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions paid to unitholders (Note 10)	$ (435)	$ (770)