Receivables, Loans, Notes Receivable, and Others (Policies)	12 Months Ended
Dec. 31, 2020
Receivables [Abstract]
Trade and Other Accounts Receivable, Unbilled Receivables, Policy	Accounts receivable, net represent amounts billed and due from customers.Unbilled receivables, net represent revenue recognized under the cost-to-cost method that exceeds amounts billed to customers.

Disclosure of accounting policy for treatment of receivables that are billable but have not been billed as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-URI http://asc.fasb.org/topic&trid=2196771

Name:	us-gaap_TradeAndOtherAccountsReceivableUnbilledReceivablesPolicy
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration