Employee Benefit Plans Employee Benefit Plans (Details) (Other Postretirement Benefit Plans, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on accumulated benefit obligation	$ 1	$ 1
Amortization of loss	0	1
Net periodic cost	1	2
Contribution expected in 2013	7
Contribution made in period	$ 2