Goodwill And Acquired Intangibles (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Goodwill And Acquired Intangibles [Abstract]
Indefinite-lived intangible assets carrying amounts	$ 497	$ 499
Amortization expense of acquired finite-lived intangible assets	203	217
Estimated amortization expense, 2012	209
Estimated amortization expense, 2013	189
Estimated amortization expense, 2014	183
Estimated amortization expense, 2015	171
Estimated amortization expense, 2016	155
Non-cash investing and financing transactions related to acquired finite-lived intangibles	256	62
Total acquired finite-lived intangible assets remaining unpaid	$ 335	$ 529