CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash Flows From Operating Activities
Net income	$ 612	$ 559
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	693	571
Amortization of debt issuance cost	3	3
Deferred income taxes	375	373
(Gain) loss on derivatives excluding derivatives, settled	7	(72)
Stock-based compensation	13	9
Other	(3)	3
Change in assets and liabilities:
Accounts receivable	7	(67)
Inventories	2	(13)
Accounts payable	52	45
Taxes payable (receivable)	1	(15)
Interest payable	(10)	(8)
Advances from partners		(65)
Other assets and liabilities	22	55
Net cash provided by operating activities	1,774	1,378
Cash Flows From Investing Activities
Capital investments	(1,713)	(1,728)
Proceeds from sale of property and equipment	20	3
Transfers from restricted cash		9
Other	6	4
Net cash used in investing activities	(1,687)	(1,712)
Cash Flows From Financing Activities
Payments on current portion of long-term debt	(1)	(1)
Payments on revolving long-term debt	(3,573)	(2,135)
Borrowings under revolving long-term debt	3,429	2,378
Change in bank drafts outstanding	45	50
Proceeds from exercise of common stock options	10	7
Net cash (used in) provided by financing activities	(90)	299
Decrease in cash and cash equivalents	(3)	(35)
Cash and cash equivalents at beginning of year	23	54
Cash and cash equivalents at end of period	$ 20	$ 19