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Goodwill and Other Intangible Assets - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]        
Number of reporting units | segment     4  
Amortization expense for intangible assets included in net income $ 101 $ 86 $ 240 $ 149
GE Transaction Agreement        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense for intangible assets included in net income     68  
Trade names and trademarks        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense for intangible assets included in net income $ 32   $ 69  
Minimum        
Finite-Lived Intangible Assets [Line Items]        
Estimated useful lives     1 year  
Maximum        
Finite-Lived Intangible Assets [Line Items]        
Estimated useful lives     30 years