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Employee Retirement Benefits (Schedule of Assumptions Used) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Plans [Member]
     
Weighted-average assumptions used to determine net periodic benefit costs:      
Discount rate 4.95% 5.65% 6.10%
Average rate of increase in future compensation 4.00% 4.00% 4.00%
Expected long-term weighted-average rate of return on plan assets 7.00% 7.25% 7.50%
Weighted-average assumptions used to determine benefit obligation at year-end:      
Discount rate 4.15% 4.95% 5.65%
Average rate of increase in future compensation 4.00% 4.00% 4.00%
Other Postretirement Plans [Member]
     
Weighted-average assumptions used to determine net periodic benefit costs:      
Discount rate 4.75% 5.40% 5.75%
Weighted-average assumptions used to determine benefit obligation at year-end:      
Discount rate 4.05% 4.75% 5.40%
Health care cost trend rate assumed for next year:      
Rate that cost trend rate gradually declines to and remains at: 5.00% 5.00% 5.00%
Effect of a 1% increase in the assumed health care cost trend rate on accumulated postretirement benefit obligation 8    
Effect of a 1% decrease in the assumed health care cost trend rate on accumulated postretirement benefit obligation 11    
Pre-65 [Member] | Other Postretirement Plans [Member]
     
Health care cost trend rate assumed for next year:      
Health care cost trend rate assumed for next year 7.50% 8.00% 8.00%
Post-65 [Member] | Other Postretirement Plans [Member]
     
Health care cost trend rate assumed for next year:      
Health care cost trend rate assumed for next year 7.50% 8.00% 8.00%