Commitments and Contingencies (Impact of Legal Expenses Paid or Incurred to Date and Settlements Paid or Deemed Final) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
As of December 31, 2014	$ 24
Settlements paid	26
Legal expenses incurred and/or paid during the year ended December 31, 2015	8
As of December 31, 2015	58
Deductible [Member]
Loss Contingencies [Line Items]
As of December 31, 2014	$ 18
Settlements paid
As of December 31, 2015	$ 18
CHS Responsibility at 10% [Member]
Loss Contingencies [Line Items]
Settlements paid	3
Legal expenses incurred and/or paid during the year ended December 31, 2015	1
As of December 31, 2015	4
Reduction to Amount Owed to CVR Holders at 90% [Member]
Loss Contingencies [Line Items]
As of December 31, 2014	6
Settlements paid	23
Legal expenses incurred and/or paid during the year ended December 31, 2015	7
As of December 31, 2015	$ 36