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Basis of Presentation - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Change in Accounting Estimate [Line Items]    
Net cash used in financing activities $ 154 $ 227
Net cash provided by operating activities $ 309 349
Accounting Standards Update 2016-09    
Change in Accounting Estimate [Line Items]    
Net cash used in financing activities   2
Net cash provided by operating activities   $ 1