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Incentive Plans (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock rights and stock units 8,117,489 8,660,855 8,060,059 6,812,594
Compensation cost related to unvested restricted performace shares, executive continuity awards and restricted stock attributable to future performance, net of estimated forfeitures $ 116.0      
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      
Stock Compensation Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant 17,800,000 19,300,000 18,600,000  
Performance Shares [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 Shares [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%