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Restructuring and Separation Costs - Separation Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs $ 118 $ 0 $ 161 $ 0
Charges     89  
Separation Costs - Former Executives        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs $ 0   35  
Charges     12  
Acceleration of share-based compensation     $ 23  
Deferred termination fee | Executive Officers        
Restructuring Cost and Reserve [Line Items]        
Cash awards as a percentage of base salary     400.00%  
Deferred bonus | Former CEO        
Restructuring Cost and Reserve [Line Items]        
Cash awards as a percentage of base salary     150.00%  
Deferred bonus | Former CFO        
Restructuring Cost and Reserve [Line Items]        
Cash awards as a percentage of base salary     125.00%