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Restructuring and Separation Costs - Other Restructuring Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Restructuring Reserve    
Accrued restructuring and separation costs as of December 31, 2016   $ 0
Costs recognized $ 43 43
Cash payments   (3)
Other adjustments–acceleration of share-based compensation   (23)
Accrued restructuring and separation costs as of June 30, 2017 17 17
Separation Costs–Former Executives    
Restructuring Reserve    
Accrued restructuring and separation costs as of December 31, 2016   0
Costs recognized   35
Cash payments   (1)
Other adjustments–acceleration of share-based compensation   (23)
Accrued restructuring and separation costs as of June 30, 2017 11 11
Other Restructuring Costs    
Restructuring Reserve    
Accrued restructuring and separation costs as of December 31, 2016   0
Costs recognized   8
Cash payments   (2)
Other adjustments–acceleration of share-based compensation   0
Accrued restructuring and separation costs as of June 30, 2017 $ 6 $ 6