Commitments and Contingencies - Performance Bonds and Parent Guarantees (Details) - Performance Bonds $ in Billions	Jun. 30, 2020 USD ($)
Guarantor Obligations [Line Items]
Total amount of outstanding performance bonds	$ 3.0
Estimate
Guarantor Obligations [Line Items]
Estimated cost to complete bonded projects	$ 1.1

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