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Total Assets by Segment (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Total assets $ 63,109 $ 61,538 $ 62,843
Equity Method Investments      
Segment Reporting Information [Line Items]      
Total assets 6,345 5,585 5,387
Latin America Segment      
Segment Reporting Information [Line Items]      
Total assets 4,948 5,156 4,673
Asia Middle East Africa Segment      
Segment Reporting Information [Line Items]      
Total assets 9,883 10,031 10,460
Europe Segment      
Segment Reporting Information [Line Items]      
Total assets 21,611 19,934 21,026
North America Segment      
Segment Reporting Information [Line Items]      
Total assets 20,709 20,694 21,175
Unallocated Assets and Adjustments      
Segment Reporting Information [Line Items]      
Total assets [1] $ (387) $ 138 $ 122
[1] Unallocated assets consist primarily of cash and cash equivalents, deferred income taxes, centrally held property, plant and equipment, prepaid pension assets and derivative financial instrument balances. Final adjustments for jurisdictional netting of deferred tax assets and liabilities is done at a consolidated level.