Property, Net Of Accumulated Depreciation (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Property, Net Of Accumulated Depreciation
Land	$ 108,000,000		$ 108,000,000		$ 105,000,000
Buildings	3,729,000,000		3,729,000,000		3,692,000,000
Equipment	11,372,000,000		11,372,000,000		10,744,000,000
Construction in progress	1,370,000,000		1,370,000,000		822,000,000
Property, plant and equipment, gross	16,579,000,000		16,579,000,000		15,363,000,000
Accumulated depreciation	(6,824,000,000)		(6,824,000,000)		(6,420,000,000)
Total	9,755,000,000		9,755,000,000		8,943,000,000
Interest costs capitalized as part of property	10,000,000	3,000,000	17,000,000	8,000,000
Precious metals	2,200,000,000		2,200,000,000		2,000,000,000
Depletion expense	$ 6,000,000	$ 3,000,000	$ 10,000,000	$ 6,000,000