Employee Benefits Employee Benefits - Net Periodic Benefit Expense (Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 0	$ 0
Interest cost	22	11	13
Expected return on assets	(31)	(14)	(15)
Actuarial loss, net	3	1	0
Prior service cost	0	0	0
Settlement losses	2	4	3
Net periodic cost (income)	(3)	2	1
Health Care and Life
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	1	0	0
Expected return on assets	0	0	0
Actuarial loss, net	0	0	(1)
Prior service cost	0	0	0
Settlement losses	0	0	0
Net periodic cost (income)	$ 1	$ 0	$ (1)