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Investments - Company's Combined Proportionate Share of Major Components of Financial Statements (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]    
Current assets $ 2,041 $ 2,478
Non-current assets 4,159 4,450
Current liabilities 1,516 2,329
Long-term liabilities 1,378 1,268
Sales 5,425 5,009
Cost of goods sold, expenses and income taxes 5,099 4,668
Net income $ 326 $ 341