Contingencies (Impact of Legal Expenses Paid or Incurred to Date and Settlements Paid or Deemed Final) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Loss Contingencies [Line Items]
Beginning balance	$ 24
Settlements paid
Legal expenses incurred and/or paid during the three months ended March 31, 2015	3
Ending balance	27
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
Legal expenses incurred and/or paid during the three months ended March 31, 2015	1
Ending balance	1
Reduction to Amount Owed to CVR Holders at 90% [Member]
Loss Contingencies [Line Items]
Beginning balance	6
Settlements paid
Legal expenses incurred and/or paid during the three months ended March 31, 2015	2
Ending balance	$ 8