Special Charges And Restructuring Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 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		19
Non-cash charges		(3)
Adjustments		(4)
Payments		(141)
Remaining accrual, ending	67	67	196
Merger related expenses	6.2	21.6
Facility Exit Costs [Member]
Restructuring Reserve [Roll Forward]
Remaining accrual, beginning		4
Special Charges		6
Non-cash charges		(3)
Adjustments		(4)
Payments		(3)
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		(138)
Remaining accrual, ending	$ 67	$ 67