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Segment Reporting - Revenue and Long-lived Assets by Geography (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Total Revenues $ 5,393 $ 6,022 $ 6,408
Long-Lived Assets [1] 465 385  
United States      
Segment Reporting Information [Line Items]      
Total Revenues 4,748 5,303 5,686
Long-Lived Assets [1] 375 289  
Europe      
Segment Reporting Information [Line Items]      
Total Revenues 497 538 547
Long-Lived Assets [1] 28 42  
Other areas      
Segment Reporting Information [Line Items]      
Total Revenues 148 181 $ 175
Long-Lived Assets [1] $ 62 $ 54  
[1] _(1)Long-lived assets are comprised of (i) Land, buildings and equipment, net, (ii) Internal use software, net and (iii) Product software,