Contingencies (Trial Results Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended					168 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Since January 1999 [Member]	Dec. 31, 2012 Health Care Cost Recovery Litigation [Member]	Dec. 31, 2012 Engle and Non-Engle Cases [Member] Since January 1999 [Member]
Loss Contingencies [Line Items]
States with Litigation Appeal Bond Caps	45
Number of verdicts returned				52
Verdicts returned in favor of defendants				35
Verdicts returned in favor of plaintiffs				17
Cases reaching final resolution				15
Verdict Against Defendants Reversed					1
Judgments paid						$ 245
Judgment interest paid aggregate						139
Loss Contingency Accrual, Carrying Value, Provision	4	98	16
Loss Contingency, Settlement Agreement, Consideration			5
Loss Contingency, Interest Accrued In Period	1	64	5
Loss Contingency, Damages Paid, Value	127
Loss Contingency Accrual, at Carrying Value	$ 0	$ 122