Registration of securities issued in business combination transactions

Income Taxes (Reconciliation Of Liability for unrecognized tax benefits) (Details)

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Income Taxes (Reconciliation Of Liability for unrecognized tax benefits) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of the beginning and ending amount of the liability for unrecognized tax benefits      
Balance at the beginning of the period $ 99    
Decreases related to prior year tax positions (11)    
Increases related to current year tax positions 10    
Settlements (2)    
Lapse of statute (1)    
Balance at the end of the period 95 99  
Potential benefits net of federal tax benefit that, if recognized, would affect the effective rate on income from continuing operations 62    
Federal tax benefit 33    
Interest expense (income) on unrecognized tax benefits 1 (1) (5)
Accrued interest expense 22 21  
Penalty expense on unrecognized tax benefits 0 1 1
Maximum expected increase in unrecognized tax benefits as a result of potential settlements and revisions to settlement estimates related to transfer pricing issue 1    
Expected decrease in unrecognized tax benefits as a result of potential settlements, lapsing of statute of limitations and revisions to settlement estimates related to nonfederal tax issues $ 6