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Employee Benefit Plans - Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Employee-related Liabilities [Abstract]          
Share-based compensation expense $ 27 $ 33 $ 44 $ 56  
Unrecognized share-based compensation $ 86   $ 86   $ 53