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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	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution			$ 1,247	$ 1,240	$ 1,185
Reconciliation To Income From Continuing Operations Before Taxes
INCOME FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES			488	1,001	2,018
Net equity in earnings (losses) of affiliates	$ (112)	$ (175)	(123)	(172)	39
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest			(192)	(277)	(509)
Pre-tax contribution			173	552	1,548
Unrealized derivative and equity securities losses (gains)			(3)	(113)	(33)
Unrealized foreign currency losses (gains)			10	(36)	(51)
Disposition/acquisition losses (gains)			(112)	(12)	934
Impairment losses			(928)	(406)	(307)
Loss on extinguishment of debt			(223)	(121)	(180)
Gain (Loss) on Contract Termination			(182)	0	0
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			505	569	511
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings (losses) of affiliates			(8)	11	35
Operating Segments \| South America
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution			534	504	519
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings (losses) of affiliates			(80)	(129)	15
Operating Segments \| MCAC SBU
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution			287	367	300
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings (losses) of affiliates			(11)	(13)	(7)
Operating Segments \| EURASIA [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution			177	159	222
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings (losses) of affiliates			4	(9)	14
Intersegment Eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution			0	(12)	(21)
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			(256)	(347)	(346)
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings (losses) of affiliates			$ (28)	$ (32)	$ (18)