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Incentive Plans (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Performance Share Program [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Shares Held For Payout In Period 72,798      
Stock rights and stock units 8,660,855 8,060,059 6,812,594 6,066,050
Performance Share Program [Member] | Other Participants [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weight of return on investment (ROI) on awards 75.00%      
Weight of total shareholder return (TSR) on awards 25.00%      
Performance Share Program [Member] | Officer [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weight of return on investment (ROI) on awards 50.00%      
Weight of total shareholder return (TSR) on awards 50.00%      
Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock rights and stock units 0 350    
Incentive Compensation Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant 19,300,000 18,600,000 18,800,000  
Compensation cost related to unvested restricted performace shares, executive continuity awards and restricted stock attributable to future performance, net of estimated forfeitures 105.2      
Compensation cost related to unvested restricted performace shares, executive continuity awards and restricted stock attributable to future performance, net of estimated forfeitures, weighted-average period (in years) 1 year 8 months 12 days