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Segment Reporting - Total Assets by Segment (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Total assets $ 67,810 $ 64,515 $ 62,618
Equity Method Investments      
Segment Reporting Information [Line Items]      
Total assets [1] 6,036 7,178 7,012
Latin America      
Segment Reporting Information [Line Items]      
Total assets [1] 4,181 4,716 4,699
AMEA      
Segment Reporting Information [Line Items]      
Total assets [1] 9,997 9,740 9,571
Europe      
Segment Reporting Information [Line Items]      
Total assets [1] 21,442 20,354 19,426
North America      
Segment Reporting Information [Line Items]      
Total assets [1] 23,297 21,637 21,015
Unallocated Assets and Adjustments      
Segment Reporting Information [Line Items]      
Total assets [2] $ 2,857 $ 890 $ 895
[1] Segment assets do not reflect outstanding intercompany asset balances as intercompany accounts have been eliminated at a segment level.
[2] 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.