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Significant Accounting Policies (Details 2) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2013
item
Dec. 31, 2012
Dec. 31, 2011
Long-lived assets and definite-lived intangible assets        
Loss on impairment of assets held for sale     $ 22  
Goodwill        
Number of reporting units   2    
Goodwill impairment loss     112  
Goodwill impairment loss per diluted share from discontinued operations, net of tax     $ 0.31  
Goodwill impairment loss, tax effect     0  
Estimate of loss on impairment of goodwill per diluted share       $ 16.15
Estimated loss on impairment of goodwill, tax effect 0     0
Adjustment to original estimate of goodwill 118   118 5,200
Adjustment to original estimate of goodwill, per diluted share $ 0.33   $ 0.33  
Pension and other postretirement benefits        
Recognition period of investment gains or losses related to asset valuation for determining net periodic benefit cost   5 years    
Conditional amortization gains or losses as percentage of greater of plan assets or liabilities, minimum   10.00%    
Number of critical fair value assumptions   2    
Aggregate liability of pension and other postretirement benefit plan obligations   409 639  
Net periodic benefit costs   132 149 88
Customer relationships
       
Long-lived assets and definite-lived intangible assets        
Loss on impairment of assets held for sale     22  
Loss on impairment of assets per diluted share     $ 0.05  
Loss on impairment of assets held for sale net of tax     $ 17