Contingencies (Impact of Legal Expenses Paid or Incurred to Date and Settlements Paid or Deemed Final) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)
Loss Contingencies [Line Items]
Beginning balance	$ 24
Settlements paid	16
Legal expenses incurred and/or paid during the six months ended June 30, 2015	5
Ending balance	45
Deductible [Member]
Loss Contingencies [Line Items]
Beginning balance	$ 18
Settlements paid
Ending balance	$ 18
CHS Responsibility at 10% [Member]
Loss Contingencies [Line Items]
Settlements paid	2
Legal expenses incurred and/or paid during the six months ended June 30, 2015	1
Ending balance	3
Reduction to Amount Owed to CVR Holders at 90% [Member]
Loss Contingencies [Line Items]
Beginning balance	6
Settlements paid	14
Legal expenses incurred and/or paid during the six months ended June 30, 2015	4
Ending balance	$ 24