Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Goodwill And Other Intangible Assets [Line Items]
Gross goodwill balances	$ 7,100,000,000	$ 7,100,000,000
Estimated amortization expense for 2012	16,000,000
Estimated amortization expense for 2013	16,000,000
Estimated amortization expense for 2014	16,000,000
Estimated amortization expense for 2015	16,000,000
Estimated amortization expense for 2016	15,000,000
Estimated amortization expense for 2017	15,000,000
Telecommunications [Member]
Goodwill And Other Intangible Assets [Line Items]
Accumulated impairment losses	$ 6,500,000,000	$ 6,500,000,000