Goodwill and Other Intangible Assets (Amortization Expense on Existing Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Goodwill and Other Intangible Assets Disclosure [Abstract]
Amortization expense	$ 239	$ 249
Future amortization expense to be recognized during remainder of 2012	71
Future amortization expense to be recognized during 2013	242
Future amortization expense to be recognized during 2014	209
Future amortization expense to be recognized during 2015	181
Future amortization expense to be recognized during 2016	157
Future amortization expense to be recognized during 2017	$ 134