Contingencies (NPM Adjustment Calculation Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Loss Contingencies [Line Items]
Challenges To MSA Found In Favor Of Defendants	16
Year NPM Adjustment Calculated 2003 [Member] | Year NPM Adjustment May Be Deducted 2006 [Member]
Loss Contingencies [Line Items]
Affiliates possible excess MSA payments	$ 337
Year NPM Adjustment Calculated 2004 [Member] | Year NPM Adjustment May Be Deducted 2007 [Member]
Loss Contingencies [Line Items]
Affiliates possible excess MSA payments	388
Year NPM Adjustment Calculated 2005 [Member] | Year Npm Adjustment Deducted2008 [Member]
Loss Contingencies [Line Items]
Affiliates possible excess MSA payments	181
Year NPM Adjustment Calculated 2006 [Member] | Year NPM Adjustment May Be Deducted 2009 [Member]
Loss Contingencies [Line Items]
Affiliates possible excess MSA payments	154
Year NPM Adjustment Calculated 2007 [Member] | Year NPM Adjustment May Be Deducted 2010 [Member]
Loss Contingencies [Line Items]
Affiliates possible excess MSA payments	185
Year NPM Adjustment Calculated 2008 [Member] | Year NPM Adjustment May Be Deducted 2011 [Member]
Loss Contingencies [Line Items]
Affiliates possible excess MSA payments	250
Year NPM Adjustment Calculated 2009 [Member] | Year Npm Adjustment Deducted 2012 [Member]
Loss Contingencies [Line Items]
Affiliates possible excess MSA payments	205
Year NPM Adjustment Calculated 2010 [Member] | Year NPM Adjustment May Be Deducted 2013 [Member]
Loss Contingencies [Line Items]
Affiliates possible excess MSA payments	203
Year NPM Adjustment Calculated 2011 [Member] | Year NPM Adjustment May Be Deducted 2014 [Member]
Loss Contingencies [Line Items]
Affiliates possible excess MSA payments	159
Year NPM Adjustment Calculated 2004 - 2012 [Member]
Loss Contingencies [Line Items]
Affiliates possible excess MSA payments	92
Year NPM Adjustment Calculated 2012 [Member] | Year NPM Adjustment May Be Deducted 2015 [Member]
Loss Contingencies [Line Items]
Affiliates possible excess MSA payments	$ 199