Investment in Affiliates - Summary of Financial Information Related to the Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Total current assets	$ 4,070	$ 3,002
Total long-term assets	84	55
Total assets	4,154	3,057
Total current liabilities	3,994	2,925
Total long-term liabilities	9	16
Total liabilities	$ 4,003	$ 2,941