Accounts Receivable Factoring and Other Receivables (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Receivables [Abstract]
Proceeds from sale of accounts receivable		$ 186	$ 278
Gain (loss) on sale of accounts receivable		(1)	(2)
Accounts receivable sold, carrying value	$ 199	$ 199	$ 284
AR factoring limitation in future periods under forbearance and credit agreements	$ 75