Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Narrative (Details)

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Employee Benefit Plans - Narrative (Details) (USD $)
Share data in Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Jan. 24, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease) $ 431,000,000      
Prior Years Market Gains Losses Recognized By Asset Valuation Method For Qualified Pension Plans   60.00%    
Remaining Market Gains Losses Recognized By Asset Valuation Method For Qualified Pension Plans   40.00%    
Unrecognized Gain Loss Percentage For Post Retirement Health Care Plan   50.00%    
Defined Benefit Plan Decline in Rates Threshold to Analyze Significant Impact to Plan, Percent   0.25%    
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components   3,000,000    
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation   59,000,000    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components   3,000,000    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation   52,000,000    
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
Contribution To Qualified Defined Contribution Plans Cash   886,000,000 723,000,000 670,000,000
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)   174,000,000    
Common Stock Held By Defined Contribution Plans Shares   235 232  
Payments To Plans For Dividends On Common Stock   10,000,000 9,000,000 8,000,000
Defined Benefit Plan, Curtailments 889,000,000      
Increase (Decrease) Net Pension Assets, Amended 1,300,000,000      
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Arising During Period, before Tax 1,300,000,000 2,000,000    
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Costs (Credit) Arising During Period, Net of Tax 832,000,000      
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments (58,000,000)      
Weighted-Average Assumptions, Discount Rate   4.95%    
Nonqualified and Other Pension Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year   103,000,000    
Weighted-Average Assumptions, Expected Return on Plan Assets   5.25% 5.25% 5.25%
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Arising During Period, before Tax   0    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments   0 0  
Weighted-Average Assumptions, Discount Rate   3.65% 4.65%  
Qualified Pension Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Increase In Plan Assets With Respect To Decline In Expected Return   33,000,000    
Weighted-Average Assumptions, Expected Return on Plan Assets   8.00% 8.00% 8.00%
Defined Benefit Plan, Amount of Employer and Related Party Securities Included in Plan Assets   156,000,000 82,000,000  
Defined Benefit Plan, Equity Securities   0.96% 0.55%  
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Arising During Period, before Tax   0    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments   (889,000,000) 0  
Weighted-Average Assumptions, Discount Rate   4.00% 4.95%  
Postretirement Health and Life Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year   107,000,000    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year   7.50%    
Reduction In Assumed Health Care Cost Trend Rate   5.00%    
Weighted-Average Assumptions, Expected Return on Plan Assets   8.00% 8.00% 8.00%
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Arising During Period, before Tax   0    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments   0 0  
Weighted-Average Assumptions, Discount Rate   3.65% 4.65%  
Non-U.S. Pension Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year   109,000,000    
Weighted-Average Assumptions, Expected Return on Plan Assets   6.65% 6.58% 6.60%
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Arising During Period, before Tax   2,000,000    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments   $ 0 $ 0  
Weighted-Average Assumptions, Discount Rate   4.23% 4.87%