Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Contingencies and Litigation - Other Pending Litigation (Details) - USD ($) $ in Millions	Dec. 13, 2019	Sep. 30, 2020
HP Inc. \| Miami Firefighters Relief Pension Fund V. Icahn Et Al
Guarantor Obligations [Line Items]
Marketable securities, gain (loss)	$ 128
Performance Guarantee
Guarantor Obligations [Line Items]
Maximum exposure, undiscounted		$ 273