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Employee Retirement Benefits (Schedule of Assumptions Used) (Details) (USD $)
In Millions, unless otherwise specified
4 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2013
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Plans [Member]
         
Weighted-average assumptions used to determine net periodic benefit costs for the years ended:          
Discount rate 4.15% [1]   4.25% [1] 4.95% 5.65%
Average rate of increase in future compensation   4.00%   4.00% 4.00%
Expected long-term weighted-average rate of return on plan assets     6.75% 7.00% 7.25%
Weighted-average assumptions used to determine benefit obligation as of:          
Discount rate     4.60% 4.15% 4.95%
Average rate of increase in future compensation       4.00% 4.00%
Other Postretirement Plans [Member]
         
Weighted-average assumptions used to determine net periodic benefit costs for the years ended:          
Discount rate     4.05% 4.75% 5.40%
Weighted-average assumptions used to determine benefit obligation as of:          
Discount rate     4.93% 4.05% 4.75%
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     $ 6    
Effect of a 1% decrease in the assumed health care cost trend rate on accumulated postretirement benefit obligation     $ 8    
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     7.00% 7.50% 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     7.00% 7.50% 8.00%
[1] The pension benefit plans were remeasured as of April 30, 2013. As a result, a discount rate of 4.15% was used for the period January 1 through April 30, 2013.