Valuation and Qualifying Accounts (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance For Doubtful Accounts [Member]
Movement In Valuation Allowances And Reserves Roll Forward
Valuation Allowances and Qualifying Accounts, Beginning Balance	$ 131,000,000	$ 143,000,000	$ 144,000,000
Balance Acquired through Acquisitions	0	0	0
Charged to Costs and Expenses	30,000,000	43,000,000	47,000,000
Charged to Other Accounts	9,000,000	1,000,000	1,000,000
Deductions	56,000,000	56,000,000	49,000,000
Valuation Allowance and Qualifying Account, Ending Balance	114,000,000	131,000,000	143,000,000
Valuation Allowance On Deferred Tax Assets [Member]
Movement In Valuation Allowances And Reserves Roll Forward
Valuation Allowances and Qualifying Accounts, Beginning Balance	339,000,000	225,000,000	191,000,000
Balance Acquired through Acquisitions	0	0	0
Charged to Costs and Expenses	2,000,000	114,000,000	34,000,000
Charged to Other Accounts	0	0	0
Deductions	0	0	0
Valuation Allowance and Qualifying Account, Ending Balance	341,000,000	339,000,000	225,000,000
Inventory Valuation Reserve Member
Movement In Valuation Allowances And Reserves Roll Forward
Valuation Allowances and Qualifying Accounts, Beginning Balance	22,000,000	29,000,000	27,000,000
Balance Acquired through Acquisitions	0	0	0
Charged to Costs and Expenses	14,000,000	10,000,000	18,000,000
Charged to Other Accounts	0	0	0
Deductions	9,000,000	17,000,000	16,000,000
Valuation Allowance and Qualifying Account, Ending Balance	$ 27,000,000	$ 22,000,000	$ 29,000,000