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

Commitments and Contingencies - Bonds and Parent Guarantees (Details) - USD ($) $ in Millions	1 Months Ended
	Apr. 30, 2019	Mar. 31, 2021
Performance Bonds
Guarantor Obligations [Line Items]
Total amount of outstanding performance bonds		$ 4,000
Estimate \| Performance Bonds
Guarantor Obligations [Line Items]
Estimated cost to complete bonded projects		$ 1,400
PRONATEL \| Project Contract Termination
Guarantor Obligations [Line Items]
Bond proceeds received	$ 112