Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Balance Sheet Parentheticals [Abstract]
Receivables, allowances	$ 112	$ 114
Treasury Stock, at cost, Class B Shares	171,000,000	162,000,000
Class A Common Stock
Class Of Stock [Line Items]
Common Stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common Stock, shares authorized	375,000,000	375,000,000
Common Stock, shares issued	44,000,000	44,000,000
Class B Common Stock
Class Of Stock [Line Items]
Common Stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common Stock, shares authorized	5,000,000,000	5,000,000,000
Common Stock, shares issued	776,000,000	769,000,000