Acquisitions (Aggregate of Purchase Price) (Details) (Plainfield, USD $) In Millions, unless otherwise specified	0 Months Ended	1 Months Ended
	Oct. 11, 2013	Oct. 31, 2013 Receivable from PRE Holdings	Oct. 11, 2013 Achievement of milestones	Oct. 11, 2013 January 2014 or the completion of the collateral transfer
Business Acquisition [Line Items]
Forgiveness of accounts receivable (net of $32 million bad debt expense)	$ 105
Bad debt expense		32
Contingent consideration	6		3	2
Total purchase consideration	$ 111