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Acquisitions, Goodwill and Other Intangible Assets (Goodwill) (Details) - Range [Domain]
€ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jun. 20, 2014
EUR (€)
Jun. 02, 2014
USD ($)
Mar. 21, 2014
USD ($)
Feb. 12, 2014
USD ($)
Aug. 31, 2013
USD ($)
Jul. 31, 2013
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Goodwill [Line Items]                  
Goodwill (Note 8)             $ 62,983 $ 63,413 $ 58,762
Payments to Acquire Businesses, Net of Cash Acquired             2,639 1,634 $ 1,456
Increase (Decrease) in Intangible Assets, Current             2,078    
Intangible assets subject to amortization             13,725 13,707  
Indefinite-lived intangible assets             130 160  
Total             13,855 13,867  
Dispositions, currency exchange and other             (1,764) (678)  
Goodwill, Acquired During Period             1,334 5,329  
Goodwill, period increase (decrease)             (430) 4,651  
Commercial Real Estate Portfolio Segment [Member]                  
Goodwill [Line Items]                  
Implied Fair Value Of Goodwill Exceeding Carrying Value Of Goodwill               3,700  
Energy Management Power Conversion Member [Member]                  
Goodwill [Line Items]                  
Goodwill (Note 8)             $ 1,500    
Reporting Unit Percentage Of Fair Value In Excess Of Carrying Amount             10.00%    
Reporting Unit Goodwill As Percent Of Total             2.00%    
Acquisition API Healthcare                  
Goodwill [Line Items]                  
Payments to Acquire Businesses, Net of Cash Acquired       $ 340          
Increase (Decrease) in Intangible Assets, Current             $ 125    
Goodwill, Acquired During Period             280    
Acquisition Avio SpA                  
Goodwill [Line Items]                  
Payments to Acquire Businesses, Net of Cash Acquired         $ 4,449        
Increase (Decrease) in Intangible Assets, Current               1,817  
Business Acquisition, Preexisting Relationship, Gain (Loss) Recognized         $ (96)        
Goodwill, period increase (decrease)               3,230  
Acquisition Lufkin Industries Inc                  
Goodwill [Line Items]                  
Payments to Acquire Businesses, Net of Cash Acquired           $ 3,309      
Increase (Decrease) in Intangible Assets, Current               997  
Goodwill, Acquired During Period               $ 2,120  
Acquisition Thermo Fisher                  
Goodwill [Line Items]                  
Payments to Acquire Businesses, Net of Cash Acquired     $ 1,065            
Increase (Decrease) in Intangible Assets, Current             320    
Goodwill, Acquired During Period             $ 700    
Acquisition Alstom                  
Goodwill [Line Items]                  
Payments to Acquire Businesses, Net of Cash Acquired | € € 260                
Estimated Purchase Price to Aquire Business, Net of Cash Acquired | € 12,350                
Anticipated Third Party Investment In Joint Venture | € € 2,600                
Acquisition Cameron's Reciprocating Compression Div                  
Goodwill [Line Items]                  
Goodwill (Note 8)   $ 250              
Payments to Acquire Businesses, Net of Cash Acquired   550              
Increase (Decrease) in Intangible Assets, Current   $ 100