Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011 Accounts Receivable - Allowance for Doubtful Accounts [Member]	Dec. 31, 2010 Accounts Receivable - Allowance for Doubtful Accounts [Member]	Dec. 31, 2009 Accounts Receivable - Allowance for Doubtful Accounts [Member]	Dec. 31, 2011 Deferred Tax Assets - Valuation Allowance [Member]	Dec. 31, 2010 Deferred Tax Assets - Valuation Allowance [Member]	Dec. 31, 2009 Deferred Tax Assets - Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		$ 326	$ 322	$ 238	$ 1,666	$ 1,759	$ 1,693
Additions charged to costs and expenses		73	75	112
Deductions from reserves		(107)	(71)	(28)
Net charges (benefits) to income tax expense	39				73	(19)	55
Additions charged to other comprehensive income (loss)					236	0	0
Currency translation					(4)	(74)	11
Balance at end of period		$ 292	$ 326	$ 322	$ 1,971	$ 1,666	$ 1,759