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Equity - Non-controlling interest (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Noncontrolling Interest [Line Items]    
Noncontrolling interests $ 23,006 $ 24,133
Other noncontrolling interests 109 140
General Electric Company    
Noncontrolling Interest [Line Items]    
Noncontrolling interests $ 22,897 $ 23,993