Cash And Cash Equivalents Net Change in Operating Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash and Cash Equivalents [Abstract]
Accounts receivable	$ (751)	$ (659)
Accounts receivable from related companies	(23)	(48)
Inventories	338	(48)
Exchanges receivable	(44)	11
Other current assets	39	36
Other non-current assets, net	(15)	(6)
Accounts payable	441	435
Accounts payable to related companies	57	3
Exchanges payable	(1)	14
Accrued and other current liabilities	104	(35)
Other non-current liabilities	(25)	17
Price risk management assets and liabilities, net	39	(23)
Net change in operating assets and liabilities, net of effects of acquisitions and deconsolidations	$ 159	$ (303)