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Segments and Geographic Information Segment and Geographic Information (Adjusted Pre-Tax Contributions & Reconcilliation of Income Before Income Taxes) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution		$ 1,017	$ 850	$ 1,151
Reconciliation To Income From Continuing Operations Before Taxes
Unrealized derivative gains		(3)	(9)	(166)
Unrealized foreign currency (gains) losses		(59)	22	95
Disposition/acquisition (gains) losses		123	6	(42)
Impairment losses		542	933	504
Loss on extinguishment of debt		62	29	179
One time restructuring costs	[1]	31	0	0
INCOME FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES		771	187	989
Net equity in earnings of affiliates		71	36	105
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		(521)	354	513
Pre-tax contribution		321	(131)	581
Operating Segments | US SBU
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution		361	347	360
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings of affiliates		41	9	0
Operating Segments | Andes SBU
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution		386	390	482
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings of affiliates		28	15	83
Operating Segments | Brazil SBU
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution		60	38	92
Operating Segments | MCAC SBU
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution		340	267	327
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings of affiliates		(4)	(2)	0
Operating Segments | EURASIA [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution		290	283	331
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings of affiliates		9	13	18
Corporate, Non-Segment [Member] | Corporate and Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution		(420)	(475)	(441)
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings of affiliates		$ (3)	$ 1	$ 4
[1] One-time restructuring charges consisting of severance costs related to workforce reductions.

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