Related Party Transactions (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Significant transactions with related parties
Related Party Purchases		$ 24	$ 23
Operating expenses and selling, general and administrative expenses		15	12
Net interest (income) expense	[1]	$ (3)	$ (3)

[1] *We paid interest to, or received interest from, various affiliates. See Note ##NILR—Investments, Loans and Long-Term Receivables, for additionalinformation on loans to affiliated companies.