Severance, Exit Costs and Asset Impairments Severance, Exit Costs and Asset Impairments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]
Asset impairments		$ 0
Successor [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairments	0	0
Lease and access exit costs [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring And Related Cost Expected Future Cost		275
Lease and access exit costs [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring And Related Cost Expected Future Cost		$ 375