Related Party Transactions (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Significant transactions with related parties
Operating revenues and other income		$ 118	$ 119	$ 102
Purchases		97	190	184
Operating expenses and selling, general and administrative expenses		62	70	35
Net interest expense	[1]			$ 31
Net Interest Income	[2]	$ (9)	$ (44)

[1] *We paid interest to, or received interest from, various affiliates. See Note 7—Investments, Loans and Long-Term Receivables, for additional information on loans to affiliated companies.

[2] *We paid interest to, or received interest from, various affiliates. See Note 7—Investments, Loans and Long-Term Receivables, for additional information on loans to affiliated companies.