Commitments and Contingencies (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011
Environmental Exit Cost [Line Items]
Environmental Remediation Costs Low Cost estimate	$ 174
Environmental Remediation Costs High Cost Estimate	292
Environmental Remediation Costs Amount Recorded	189
Enviromental Remediation Costs Expected Costs Over Next Twelve Months	24
Environmental Exit Costs Reasonably Possible Additional Losses	$46
Georgia And Florida [Member]
Environmental Exit Cost [Line Items]
Environmental Remediation Costs Low Cost estimate	39
Environmental Remediation Costs High Cost Estimate	101
Environmental Remediation Costs Amount Recorded	56
Enviromental Remediation Costs Expected Costs Over Next Twelve Months	7
New Jersey [Member]
Environmental Exit Cost [Line Items]
Environmental Remediation Costs Low Cost estimate	124
Environmental Remediation Costs High Cost Estimate	175
Environmental Remediation Costs Amount Recorded	122
Enviromental Remediation Costs Expected Costs Over Next Twelve Months	13
North Carolina [Member]
Environmental Exit Cost [Line Items]
Environmental Remediation Costs Low Cost estimate	11
Environmental Remediation Costs High Cost Estimate	16
Environmental Remediation Costs Amount Recorded	11
Enviromental Remediation Costs Expected Costs Over Next Twelve Months	$ 4