Separation Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Separation Costs [Abstract]
Advisory fees and other	$ 0	$ 2	$ 0	$ 5
Rebranding and marketing costs	0	2	0	4
Information and technology costs	0	1	1	1
Employee Retention And Hiring Costs	0	1	0	1
Lease Termination And Other Real Estate Costs	1	0	1	0
Total separation costs in operating income	1	6	2	11
Income tax (benefit) expense	0	(2)	0	(3)
Total separation costs, net of tax	$ 1	$ 4	$ 2	$ 8