Acquisition and Restructuring Costs (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Business Operations And Information Technology Transformation Program [Member]	Sep. 30, 2012 Business Operations And Information Technology Transformation Program [Member] employees	Dec. 31, 2011 Business Operations And Information Technology Transformation Program [Member] employees	Dec. 31, 2010 Business Operations And Information Technology Transformation Program [Member] employees	Sep. 30, 2012 Expenses Control Measures [Member] employees	Sep. 30, 2011 Expenses Control Measures [Member] employees	Sep. 30, 2012 Pre-Tax Restructuring Charges [Member] Business Operations And Information Technology Transformation Program [Member]	Dec. 31, 2011 Pre-Tax Restructuring Charges [Member] Expenses Control Measures [Member]	Sep. 30, 2012 Pre-Tax Restructuring Charges [Member] Expenses Control Measures [Member]	Sep. 30, 2012 Employee Severance [Member] Business Operations And Information Technology Transformation Program [Member] employees	Sep. 30, 2012 Involuntarily Terminated [Member] employees	Sep. 30, 2012 Involuntarily Terminated [Member] Business Operations And Information Technology Transformation Program [Member] employees
Business Acquisition [Line Items]
Additional restructuring-related accruals			$ 48			$ 48	$ 133	$ 156			$ 337	$ 120	$ (3)
Number of employees involuntarily terminated						472	530	1,400	357	442				1,930	372	1,804
Percentage of global workforce								5.00%
Restructuring charges, net	$ 15	$ 66	$ 45	$ 75	$ 0	$ 48