Goodwill & Other Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Reporting_Unit	Dec. 31, 2011	Dec. 31, 2010
Goodwill [Line Items]
Reporting units for goodwill impairment testing	21
Goodwill	$ 15,462.0	$ 14,474.3	$ 10,393.7
Finite-lived intangible assets, weighted-average life, years	13 years
Total intangible amortization expense	342	284	199
Future amortization expense, year one	364
Future amortization expense, year two	327
Future amortization expense, year three	294
Future amortization expense, year four	265
Future amortization expense, year five	238
Minimum
Goodwill [Line Items]
Goodwill	7.0
Maximum
Goodwill [Line Items]
Goodwill	$ 3,900.0