Contingencies (NPM Adjustment Calculation) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Loss Contingencies [Line Items]
Partial liability reduction percentage for 2003 NPM adjustment for states that are party to agreement re: arbitration	20.00%
Challanges To MSA Found In Favor Of Defendants	16
Year NPM Adjustment Calculated 2012 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	$ 199
Year Npm Adjustment Calculated2011 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	159
Year Npm Adjustment Calculated2010 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	203
Year NPM Adjustment Calculated 2009 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	205
Year Npm Adjustment Calculated2008 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	250
Year Npm Adjustment Calculated2007 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	185
Year Npm Adjustment Calculated2006 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	154
Year Npm Adjustment Calculated2005 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	181
Year Npm Adjustment Calculated2004 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	388
Year Npm Adjustment Calculated2003 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	$ 337