Segments and Geographic Information Segment and Geographic Information (Adjusted Pre-Tax Contributions & Reconcilliation of Income Before Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution		$ 1,240	$ 1,185	$ 1,017
Reconciliation To Income From Continuing Operations Before Taxes
INCOME FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES		1,001	2,018	771
Net equity in earnings (losses) of affiliates	$ (175)	(172)	39	71
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		(277)	(509)	(521)
Pre-tax contribution		552	1,548	321
Unrealized derivative and equity securities losses (gains)		(113)	(33)	3
Unrealized foreign currency losses (gains)		(36)	(51)	59
Disposition/acquisition losses (gains)		(12)	934	(123)
Impairment expense		(406)	(307)	(542)
Loss on extinguishment of debt		(121)	(180)	(62)
One time restructuring costs		0	0	31
Operating Segments \| US and Utilities SBU
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution		569	511	424
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings (losses) of affiliates		11	35	41
Operating Segments \| South America [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution		504	519	446
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings (losses) of affiliates		(129)	15	28
Operating Segments \| MCAC SBU
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution		367	300	277
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings (losses) of affiliates		(13)	(7)	(4)
Operating Segments \| EURASIA [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution		159	222	290
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings (losses) of affiliates		(9)	14	9
Intersegment Eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution		(12)	(21)	(9)
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		(347)	(346)	(411)
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings (losses) of affiliates		$ (32)	$ (18)	$ (3)

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