Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

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Basis of Presentation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain (loss) on dispositions, net     $ (18)    
Buy Seasons | Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Disposal Group Revenue $ 13   13 $ 29  
Disposal Group Net Earnings Loss $ (2)   $ (1) $ (7)  
Disposal Group Assets         $ 23
Gain (loss) on dispositions, net   $ (18)