Supplemental Financial Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Interest Expense, Net
Interest expense	$ 73	$ 79	$ 143	$ 151
Interest income	(4)	(4)	(9)	(10)
Interest expense, net	69	75	134	141
Inventories, Net
Finished goods	320		320		485
Work-in-process	466		466		404
Raw materials	262		262		261
Inventories, net	1,048		1,048		1,150
Property and Equipment, Net
Property and equipment, gross	7,147		7,147		6,909
Less accumulated depreciation	(4,760)		(4,760)		(4,611)
Property and equipment, net	2,387		2,387		2,298
Depreciation expense	$ 103	$ 100	$ 192	$ 192