CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash Flows From Operating Activities
Net income	$ 401	$ 373
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	455	366
Amortization of debt issuance cost	2	2
Deferred income taxes	267	233
(Gain) loss on derivatives excluding derivatives, settled	62	(63)
Stock-based compensation	9	6
Other		1
Change in assets and liabilities:
Accounts receivable	(49)	(68)
Inventories		(6)
Accounts payable	53	48
Taxes payable (receivable)	(2)	18
Advances from partners		(69)
Other assets and liabilities	(4)	37
Net cash provided by operating activities	1,194	878
Cash Flows From Investing Activities
Capital investments	(1,144)	(1,176)
Proceeds from sale of property and equipment	17
Transfers from restricted cash		9
Other	3	6
Net cash used in investing activities	(1,124)	(1,161)
Cash Flows From Financing Activities
Payments on current portion of long-term debt	(1)	(1)
Payments on revolving long-term debt	(2,486)	(1,233)
Borrowings under revolving long-term debt	2,375	1,463
Change in bank drafts outstanding	30	21
Proceeds from exercise of common stock options	9	5
Net cash (used in) provided by financing activities	(73)	255
Decrease in cash and cash equivalents	(3)	(28)
Cash and cash equivalents at beginning of year	23	54
Cash and cash equivalents at end of period	$ 20	$ 26