Acquisitions and Divestitures (Divestitures) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income Statement reclassified results of discontinued operations
Loss from discontinued operations, net of tax	$ 0	$ (1)	$ 0	$ (2)
Assets and liabilities reclassified as held for sale
Accounts receivable, net	1,338	1,133	1,338	1,133	1,045
Other liabilities	469	402	469	402	422
Broadcasting Group [Member]
Income Statement reclassified results of discontinued operations
Revenue		22		67
Costs and expenses		23		68
Loss before taxes on income		(1)		(1)
Provision for taxes on income		0		1
Loss from discontinued operations, net of tax		(1)		(2)
Assets and liabilities reclassified as held for sale
Accounts receivable, net		18		18
Property and equipment, net		25		25
Other intangible assets, net		46		46
Other assets		12		12
Assets held for sale		101		101
Accounts payable and accrued expenses		6		6
Other liabilities		9		9
Liabilities held for sale		$ 15		$ 15