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Pension and Other Postretirement Benefit Plans (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Other Postretirement Benefits
Dec. 31, 2013
Other Postretirement Benefits
Dec. 31, 2012
Other Postretirement Benefits
Dec. 31, 2011
Other Postretirement Benefits
Mar. 31, 2013
Fixed Income Funds [Member]
Mar. 31, 2013
Equity Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Defined Benefit Plan, Target Plan Asset Allocations               58.00% 42.00%
DefinedContributionPlanCompanyMatchPercentage 7.00%                
Defined Contribution Plan, Cost Recognized $ 68 $ 64 $ 68            
Plan amendments       138 2 (2)      
Curtailment gain $ 0 $ 52 $ 35   $ 0 $ 52 $ 35