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Notes Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Notes Receivable    
Notes receivable (a) $ 34 $ 73
Notes receivable, current [1] 17 20
Notes receivable, noncurrent $ 17 $ 53
[1] The current portion of notes receivable is recorded in prepayments and other current assets on the consolidated balance sheets.