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Accounts and Notes Receivable and Credit Quality of Receivables - Components of Accounts and Notes Receivable, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Current:    
Accounts receivable $ 650 $ 615
Notes receivable 146 138
Allowance for doubtful accounts and notes (37) (40)
Current accounts and notes receivable, net 759 713
Long-term:    
Notes receivable, net of allowance 52 40
Total accounts and notes receivable, net $ 811 $ 753