Segment Reporting - Total Assets by Segment (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total assets		$ 64,549	$ 62,729	$ 62,957
Equity Method Investments
Segment Reporting Information [Line Items]
Total assets	[1]	7,212	7,123	6,193
Latin America
Segment Reporting Information [Line Items]
Total assets	[1]	4,716	4,699	4,948
AMEA
Segment Reporting Information [Line Items]
Total assets	[1]	9,740	9,571	9,883
Europe
Segment Reporting Information [Line Items]
Total assets	[1]	20,354	19,426	21,611
North America
Segment Reporting Information [Line Items]
Total assets	[1]	21,637	21,015	20,709
Unallocated Assets and Adjustments
Segment Reporting Information [Line Items]
Total assets	[2]	$ 890	$ 895	$ (387)

[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.