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Postretirement Benefit Plans (Plan Assets) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Pension Benefit Plan [Member]
   
Asset Allocation    
Parentage Of US Government Direct And Indirect Obligations Represented In Plan Assets 16.00%  
Pension Benefit Plan [Member] | Principal pension plans
   
Fair Value of Plan Assets    
Fair value of plan assets, Balance at January 1, $ 44,738 $ 42,137
Actual gain (loss) on plan assets 6,312 4,854
Employer contributions 225 642
Participant contributions (156) (157)
Benefits paid (3,134) (3,052)
Acquisitions (dispositions)-net 0 0
Exchange rate adjustments 0 0
Fair value of plan assets, Balance at December 31, 48,297 44,738
Asset Allocation    
Percentage Of Trust Assets That Were Investments In Restricted Securities Excluding Real Estate Investments That Are Not Freely Tradable 17.00%  
Percentage Of Securities That May Be Rated A-2/P-2 15.00%  
Maximum Percentage Of Total Assets That Can Be Real Estate Investments 25.00%  
Maximum Percentage Of Total Assets That Can Be Investments In Restricted Securites Excluding Real Estate Investments That Are Not Freely Tradable 30.00%  
Percentage Of Fair Value Of Trust Assets At Time Of Purchase Of Aggregate Holdings Of All Qualifying Employer Securities And Qualifying Employer Real Property 10.00%  
Percentage Of Trust Assets Comprised Of Qualifying Employer Securities 4.50% 4.20%
Maximum Percentage Of Sector Concentration Of Plan Assets 15.00%  
Pension Benefit Plan [Member] | Principal pension plans | Equity Securities [Member]
   
Asset Allocation    
Debt securities (including cash equivalents), minimum 17.00%  
Debt securities (including cash equivalents), maximum 57.00%  
Actual allocation 45.00%  
Pension Benefit Plan [Member] | Principal pension plans | Debt Securities [Member]
   
Asset Allocation    
Debt securities (including cash equivalents), minimum 13.00%  
Debt securities (including cash equivalents), maximum 53.00%  
Actual allocation 31.00%  
Pension Benefit Plan [Member] | Principal pension plans | Private Equities [Member]
   
Asset Allocation    
Debt securities (including cash equivalents), minimum 8.00%  
Debt securities (including cash equivalents), maximum 18.00%  
Actual allocation 13.00%  
Pension Benefit Plan [Member] | Principal pension plans | Real Estate Asset [Member]
   
Asset Allocation    
Debt securities (including cash equivalents), minimum 2.00%  
Debt securities (including cash equivalents), maximum 12.00%  
Actual allocation 7.00%  
Pension Benefit Plan [Member] | Principal pension plans | Other Securities [Member]
   
Asset Allocation    
Debt securities (including cash equivalents), minimum 3.00%  
Debt securities (including cash equivalents), maximum 13.00%  
Actual allocation 4.00%  
Pension Benefit Plan [Member] | Principal pension plans | US Equity Securities [Member]
   
Asset Allocation    
Actual allocation 26.00%  
Pension Benefit Plan [Member] | Principal pension plans | Non US Equity Securities [Member]
   
Asset Allocation    
Actual allocation 19.00%  
Pension Benefit Plan [Member] | Other Pension Plan, Defined Benefit [Member]
   
Fair Value of Plan Assets    
Fair value of plan assets, Balance at January 1, 9,702 8,381
Actual gain (loss) on plan assets 1,212 720
Employer contributions 673 737
Participant contributions (14) (16)
Benefits paid (477) (425)
Acquisitions (dispositions)-net (31) 0
Exchange rate adjustments (34) 273
Fair value of plan assets, Balance at December 31, 11,059 9,702
Asset Allocation    
Equity securities (weighted average) 55.00%  
Debt securities (including cash equivalents) (weighted average) 32.00%  
Private equities (weighted average) 2.00%  
Real estate (weighted average) 6.00%  
Other (weighted average) 5.00%  
Pension Benefit Plan [Member] | Other Pension Plan, Defined Benefit [Member] | Equity Securities [Member]
   
Asset Allocation    
Actual allocation 55.00%  
Pension Benefit Plan [Member] | Other Pension Plan, Defined Benefit [Member] | Debt Securities [Member]
   
Asset Allocation    
Actual allocation 34.00%  
Pension Benefit Plan [Member] | Other Pension Plan, Defined Benefit [Member] | Private Equities [Member]
   
Asset Allocation    
Actual allocation 1.00%  
Pension Benefit Plan [Member] | Other Pension Plan, Defined Benefit [Member] | Real Estate Asset [Member]
   
Asset Allocation    
Actual allocation 5.00%  
Pension Benefit Plan [Member] | Other Pension Plan, Defined Benefit [Member] | Other Securities [Member]
   
Asset Allocation    
Actual allocation 5.00%  
Retiree Benefit Plan [Member]
   
Asset Allocation    
Percentage Of Securities That May Be Rated A-2/P-2 15.00%  
Maximum Percentage Of Total Assets That Can Be Real Estate Investments 10.00%  
Percentage Of Trust Assets Comprised Of Qualifying Employer Securities 4.00% 5.80%
Retiree Benefit Plan [Member] | Equity Securities [Member]
   
Asset Allocation    
Debt securities (including cash equivalents), minimum 35.00%  
Debt securities (including cash equivalents), maximum 75.00%  
Actual allocation 39.00%  
Retiree Benefit Plan [Member] | Debt Securities [Member]
   
Asset Allocation    
Debt securities (including cash equivalents), minimum 11.00%  
Debt securities (including cash equivalents), maximum 46.00%  
Actual allocation 38.00%  
Retiree Benefit Plan [Member] | Private Equities [Member]
   
Asset Allocation    
Debt securities (including cash equivalents), minimum 0.00%  
Debt securities (including cash equivalents), maximum 25.00%  
Actual allocation 14.00%  
Retiree Benefit Plan [Member] | Real Estate Asset [Member]
   
Asset Allocation    
Debt securities (including cash equivalents), minimum 0.00%  
Debt securities (including cash equivalents), maximum 12.00%  
Actual allocation 7.00%  
Retiree Benefit Plan [Member] | Other Securities [Member]
   
Asset Allocation    
Debt securities (including cash equivalents), minimum 0.00%  
Debt securities (including cash equivalents), maximum 10.00%  
Actual allocation 2.00%  
Retiree Benefit Plan [Member] | US Equity Securities [Member]
   
Asset Allocation    
Debt securities (including cash equivalents), minimum 18.00%  
Debt securities (including cash equivalents), maximum 38.00%  
Actual allocation 23.00%  
Retiree Benefit Plan [Member] | Non US Equity Securities [Member]
   
Asset Allocation    
Debt securities (including cash equivalents), minimum 17.00%  
Debt securities (including cash equivalents), maximum 37.00%  
Actual allocation 16.00%  
Retiree Benefit Plan [Member] | Fair Value Of Plan Assets [Member]
   
Fair Value of Plan Assets    
Fair value of plan assets, Balance at January 1, 946 1,004
Actual gain (loss) on plan assets 118 98
Employer contributions 533 548
Participant contributions 52 54
Benefits paid (746) (758)
Fair value of plan assets, Balance at December 31, $ 903 $ 946