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Summary of Significant Accounting Policies - Segments (Details)
$ in Millions
7 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]        
Payments to Acquire Businesses, Net of Cash Acquired   $ 629 $ 9,314 $ 24
Goodwill, Acquired During Period   $ 54 $ 508  
Number of Operating Segments | Segment   3    
GE Healthcare [Member]        
Business Acquisition [Line Items]        
Payments to Acquire Businesses, Net of Cash Acquired $ 9,000      
Cash Acquired from Acquisition 180      
Business Combination, Total Assets Acquired   $ 9,200    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Receivable   8,200    
Business Combination, Acquired Intangibles   $ 134    
Goodwill, Acquired During Period $ 518