Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accounts receivable - trade, allowance for doubtful accounts (in dollars)	$ 39	$ 23
Property, plant and equipment, accumulated depreciation (in dollars)	5,194	4,570
Accumulated amortization on intangible assets (in dollars)	$ 1,628	$ 1,452
3.625% convertible perpetual preferred stock, interest rate (as a percent)	3.625%	3.625%
Treasury Stock, Shares	76,505,718	76,664,199