New Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2020
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Allowance for credit losses	In accordance with the guidance described above, we maintain an allowance for credit losses, which represents the portion of our financial assets (accounts receivable and contract assets) that we do not expect to collect over the contractual life of such assets. Credit losses are recorded when we believe a customer, or group of customers, may not be able to meet their financial obligations due to deterioration in financial condition or credit rating. A considerable amount of judgment is required in determining expected credit losses. Relevant factors include our prior collection history with our customers, the related aging of past due balances, projections of credit losses based on historical trends in credit quality indicators or past events, and forecasts of future economic conditions.