Special Charges And Restructuring Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012 position
Restructuring Cost and Reserve [Line Items]
Principal terms of new business, headcount reduced			10,500
Restructuring Reserve [Roll Forward]
Remaining accrual, beginning		$ 196
Special Charges		20
Non-cash charges		(3)
Adjustments		(4)
Payments		(158)
Remaining accrual, ending	51	51	196
Merger related expenses	13.8	35.4
Facility Exit Costs [Member]
Restructuring Reserve [Roll Forward]
Remaining accrual, beginning		4
Special Charges		7
Non-cash charges		(3)
Adjustments		(4)
Payments		(4)
Remaining accrual, ending	0	0
Employee Charges [Member]
Restructuring Reserve [Roll Forward]
Remaining accrual, beginning		192
Special Charges		13
Non-cash charges		0
Adjustments		0
Payments		(154)
Remaining accrual, ending	$ 51	$ 51