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Reorganization of Business - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
employee
Oct. 01, 2016
USD ($)
Sep. 30, 2017
USD ($)
employee
Oct. 01, 2016
USD ($)
Dec. 31, 2016
USD ($)
Restructuring Cost and Reserve [Line Items]          
Reorganization of business charges $ 8 $ 7 $ 30 $ 74  
Restructuring, additional charges     35    
Restructuring reserve 55   55   $ 102
Restructuring charges settled with cash     77    
Asset impairment 1 0 1 0  
Restructuring, reversal of accruals no longer needed     5    
Employee separation costs          
Restructuring Cost and Reserve [Line Items]          
Reorganization of business charges       54  
Restructuring, additional charges 7 8 30    
Restructuring reserve $ 46   46   95
Restructuring charges settled with cash     $ 74    
Restructuring charges in the period for total employee severance (in number of employees) | employee     400    
Number of employees expected to be paid (in number of employees) | employee 500   500    
Restructuring, reversal of accruals no longer needed   1 $ 5    
Exit costs          
Restructuring Cost and Reserve [Line Items]          
Restructuring, additional charges $ 1   5 5  
Restructuring reserve 9   9   $ 7
Restructuring charges settled with cash     3    
Restructuring, reversal of accruals no longer needed     0 5  
Asset Impairment Due to Reorganization          
Restructuring Cost and Reserve [Line Items]          
Asset impairment       20  
Asset Impairment Due to Reorganization | Building          
Restructuring Cost and Reserve [Line Items]          
Asset impairment       17  
Asset Impairment Due to Reorganization | Corporate aircraft          
Restructuring Cost and Reserve [Line Items]          
Asset impairment       3  
Other charges          
Restructuring Cost and Reserve [Line Items]          
Reorganization of business charges 6 6 22 48  
Costs of sales          
Restructuring Cost and Reserve [Line Items]          
Reorganization of business charges $ 2 $ 1 $ 8 $ 26