Segment Financial Data (Table) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]          
Total net sales $ 16,168   $ 15,462 $ 48,104 $ 45,867
Operating profit 2,746   2,366 7,199 6,879
Operating profit margin 17.00%   15.30% 15.00% 15.00%
UTC Climate, Controls and Security [Member]
          
Segment Reporting Information [Line Items]          
Total net sales 4,351   4,237 12,631 12,617
Operating profit 807   696 2,159 1,968
Operating profit margin 18.50%   16.40% 17.10% 15.60%
Otis [Member]
          
Segment Reporting Information [Line Items]          
Total net sales 3,326   3,188 9,646 9,140
Operating profit 703   681 1,966 1,906
Operating profit margin 21.10%   21.40% 20.40% 20.90%
Pratt and Whitney [Member]
          
Segment Reporting Information [Line Items]          
Total net sales 3,564   3,386 10,485 10,412
Operating profit 633   439 1,453 1,412
Operating profit margin 17.80%   13.00% 13.90% 13.60%
UTC Aerospace Systems [Member]
          
Segment Reporting Information [Line Items]          
Total net sales 3,535   3,312 10,621 9,896
Operating profit 575   501 1,767 1,501
Operating profit margin 16.30%   15.10% 16.60% 15.20%
Sikorsky [Member]
          
Segment Reporting Information [Line Items]          
Total net sales 1,620   1,541 5,365 4,356
Operating profit 152   159 (79) 405
Operating profit margin 9.40%   10.30% (1.50%) 9.30%
Other Nonrecurring Income   830      
Other Nonrecurring Expense   1,268      
Total Segments [Member]
          
Segment Reporting Information [Line Items]          
Total net sales 16,396   15,664 48,748 46,421
Operating profit 2,870   2,476 7,266 7,192
Operating profit margin 17.50%   15.80% 14.90% 15.50%
Eliminations and other [Member]
          
Segment Reporting Information [Line Items]          
Total net sales (228)   (202) (644) (554)
Operating profit 0   7 288 32
General corporate expenses [Member]
          
Segment Reporting Information [Line Items]          
Total net sales 0   0 0 0
Operating profit $ (124)   $ (117) $ (355) $ (345)