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Accounts and Notes Receivable and Credit Quality of Receivables - Components of Accounts and Notes Receivable, Net (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Current:    
Accounts receivable $ 636 $ 615
Notes receivable 127 138
Allowance for doubtful accounts and notes (38) (40)
Current accounts and notes receivable, net 725 713
Long-term:    
Notes receivable, net of allowance 33 40
Total accounts and notes receivable, net $ 758 $ 753