Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 273	$ 295	$ 276
Charged to Cost and Expense	129	43	53
Amounts Written Off	(80)	(41)	(37)
Translation Adjustment	(13)	(24)	3
Balance at End of Period	$ 309	$ 273	$ 295