Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Allowance for Doubtful Accounts Receivable, Current	$ 196	$ 241
Allowance for Doubtful Accounts Other Receivable, Current	72	66
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	2,440	2,779
Finite-Lived Intangible Assets, Accumulated Amortization	$ 1,451	$ 1,350
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	3,000,000,000	3,000,000,000
Common stock, shares issued	1,039,000,000	1,086,000,000
Common stock, shares outstanding	1,039,000,000	1,086,000,000
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0