Restructuring Charges (Schedule Of Restructuring Charges) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance		$ 20
Charged to Costs and Expenses		6	$ (1)	$ 12
Ending Reserve Balance	$ 16	16	20
Closed Restructuring Programs
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance		20	35	61
Charged to Costs and Expenses		2	(1)	12
Payments and Other		(9)	(14)	(38)
Ending Reserve Balance	13	13	20	35
Closed Restructuring Programs | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance		20	33	52
Charged to Costs and Expenses		2	(1)	10
Payments and Other		(9)	(12)	(29)
Ending Reserve Balance	13	13	20	33
Closed Restructuring Programs | Severance costs
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance		0	2	9
Charged to Costs and Expenses		0	0	2
Payments and Other		0	(2)	(9)
Ending Reserve Balance	0	0	0	$ 2
2015-2016 Cost Savings Restructuring Program
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance		0
Charged to Costs and Expenses	4	4
Payments and Other		(1)
Ending Reserve Balance	3	3	0
2015-2016 Cost Savings Restructuring Program | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance		0
Charged to Costs and Expenses		0
Payments and Other		0
Ending Reserve Balance	0	0	0
2015-2016 Cost Savings Restructuring Program | Severance costs
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance		0
Charged to Costs and Expenses		4
Payments and Other		(1)
Ending Reserve Balance	$ 3	$ 3	$ 0