Accounts Receivable Factoring and Other Receivables (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 12, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable sold, carrying value	$ 206				$ 199	$ 206	$ 382	$ 227	$ 7
Proceeds from Sale of Accounts Receivable	$ 7				186	193	373	223
Gain (loss) on sale of accounts receivable					$ (1)	$ (1)	$ (2)	$ (1)
Receivable with Imputed Interest, Face Amount			$ 65
Trade Receivables Held-for-sale, Reconciliation to Cash Flow, Deductions from Held-for-sale			$ 65
Receivable With Imputed Interest, Term			3 years	3 years
Receivable with Imputed Interest, Effective Yield (Interest Rate)			4.625%	6.50%
Proceeds from Sale of Notes Receivable		$ 59