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Employee Retirement Benefits (Narratives) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net periodic benefit costs recognized $ 94 $ 133 $ 118
Contributions [Abstract]      
Estimated employer contributions in next fiscal year 17    
Assumptions Used [Abstract]      
Increase (decrease) in plan expense due to change in assumptions used 26 22 17
Pension Plans [Member]
     
Contributions [Abstract]      
Employer contributions 25 84  
Assumptions Used [Abstract]      
Increase in the discount rate used to determine our obligation 0.45%    
Qualified Pension Plan [Member]
     
Contributions [Abstract]      
Employer contributions 16 76 124
Amount accumulated benefit obligation exceeded the fair value of plan assets 115 140  
Nonqualified Pension Plans [Member]
     
Contributions [Abstract]      
Employer contributions 9    
Estimated employer contributions in next fiscal year 9    
Supplemental Pension Plan of 2003 [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Maximum ratio of incentive compensation to base salary 50.00%    
Other Postretirement Plans [Member]
     
Contributions [Abstract]      
Employer contributions 6 6  
Estimated employer contributions in next fiscal year $ 8    
Assumptions Used [Abstract]      
Increase in the discount rate used to determine our obligation 0.88%    
Minimum [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expectations for plan level returns (years) 7 years    
Maximum [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expectations for plan level returns (years) 10 years