Contingencies (NPM Adjustment Calculation Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Loss Contingencies [Line Items]
Challenges To MSA Found In Favor Of Defendants	16
Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Partial Liability Reduction Percentage for 2003 N P M Adjustment for States that Are Party to Agreement re: Arbitration	20.00%
Year NPM Adjustment Calculated 2013 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	$ 215
Year NPM Adjustment Calculated 2012 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	207
Year Npm Adjustment Calculated 2011 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	165
Year Npm Adjustment Calculated 2010 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	219
Year NPM Adjustment Calculated 2009 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	211
Year Npm Adjustment Calculated 2008 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	250
Year Npm Adjustment Calculated 2007 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	185
Year Npm Adjustment Calculated 2006 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	154
Year Npm Adjustment Calculated 2005 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	181
Year Npm Adjustment Calculated 2004 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	388
Year Npm Adjustment Calculated 2003 [Member]
Loss Contingencies [Line Items]
Affiliates Possible Excess MSA Payments	$ 337