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Employee Retirement Benefits (Schedule of Expected Benefit Payments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Pension Plans [Member]
 
Before Medicare Part D Subsidy [Abstract]  
2014 $ 37
2015 1,763 [1]
Other Postretirement Plans [Member]
 
Before Medicare Part D Subsidy [Abstract]  
2014 8
2015 8
2016 9
2017 10
2018 10
2019 - 2023 64
Medicare Part D Subsidy [Abstract]  
2014 1
2015 1
2016 1
2017 1
2018 1
2019-2023 $ 6
[1] Benefits under the pension plans are expected to be distributed by December 31, 2015.