Goodwill and Other Intangible Assets (Amortization Expense on Existing Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Goodwill and Other Intangible Assets [Abstract]
Amortization expense	$ 145	$ 161
Future amortization expense to be recognized during remainder of 2012	136
Future amortization expense to be recognized during remainder of 2013	237
Future amortization expense to be recognized during remainder of 2014	209
Future amortization expense to be recognized during remainder of 2015	188
Future amortization expense to be recognized during remainder of 2016	162
Future amortization expense to be recognized during remainder of 2017	$ 132