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Benefit Plans (Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jan. 02, 2013
Pension [Member]
Dec. 31, 2012
Pension [Member]
Dec. 31, 2012
Post-Employment [Member]
Dec. 31, 2011
Post-Employment [Member]
Dec. 31, 2012
Post-Retirement [Member]
Dec. 31, 2012
Emerging Markets [Member]
Equity Securities [Member]
Dec. 31, 2012
Fixed Income Investments [Member]
Below Investment Grade And No Rating [Member]
Dec. 31, 2012
Corporate Bond Securities [Member]
Dec. 31, 2012
Debt Securities [Member]
Dec. 31, 2012
Equity Securities [Member]
Dec. 31, 2012
Equity Securities [Member]
Emerging Markets [Member]
Dec. 31, 2012
US Treasury Securities [Member]
Dec. 31, 2012
Other than Securities Investment [Member]
Dec. 31, 2012
Fixed Income Investments [Member]
Below Investment Grade And No Rating [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]                                      
Accumulated benefit obligation $ 7,500,000,000 $ 6,600,000,000                                  
Estimated net loss expected to be amortized from accumulated other comprehensive losses during 2013         276,000,000 18,000,000   57,000,000                      
Estimated prior service cost expected to be amortized from accumulated other comprehensive losses during 2013         10,000,000     (45,000,000)                      
Amounts charged to expense for defined contribution plans 81,000,000 106,000,000 108,000,000                                
Plan assets, target allocation percentage of equity securities                       45.00% 55.00%            
Composition of plan assets                 3.00% 6.00% 23.00%   54.00% 5.00% 17.00% 6.00% 14.00%    
Employer contributions       350,000,000                              
Minimum expected additional employer contributions in next fiscal year                                   25,000,000  
Maximum expected additional employer contributions in next fiscal year                                     50,000,000
Current portion of postretirement health care costs accrued and recognized in other accrued liabilities $ 159,000,000 $ 146,000,000                                  
Weighted-average discount rate used to determine accrued postemployment costs           2.40% 2.80%                        
Weighted-average ultimate annual turnover rate           0.50% 1.00%                        
Rate of assumed compensation cost increase           4.00%