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, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution	$ 1,185	$ 1,017	$ 850
Reconciliation To Income From Continuing Operations Before Taxes
Unrealized derivative losses (gains)	(33)	3	9
Unrealized foreign currency losses (gains)	(51)	59	(22)
Disposition/acquisition losses (gains)	934	(123)	(6)
Impairment expense	(307)	(542)	(933)
Loss on extinguishment of debt	(180)	(62)	(29)
One time restructuring costs	0	31	0
INCOME FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES	2,018	771	187
Net equity in earnings of affiliates	39	71	36
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(509)	(521)	(354)
Pre-tax contribution	1,548	321	(131)
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	511	424	392
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings of affiliates	35	41	9
Operating Segments \| Andes SBU
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution	519	446	428
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings of affiliates	15	28	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	300	277	222
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings of affiliates	(7)	(4)	(2)
Operating Segments \| EURASIA [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution	222	290	283
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings of affiliates	14	9	13
Corporate, Non-Segment [Member] \| Corporate, Other and Eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Reporting Information Adjusted Pretax Contribution	(367)	(420)	(475)
Reconciliation To Income From Continuing Operations Before Taxes
Net equity in earnings of affiliates	$ (18)	$ (3)	$ 1

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