Commitments (Narrative) (Details) - Master Services Agreement [Member] $ in Millions	1 Months Ended
	Mar. 31, 2020 USD ($)	Feb. 28, 2018 USD ($) item
Commitments [Line Items]
Commitment term		10 years
Number of agreement renewal options | item		3
Renewal option term		1 year
Percentage shortfall required if minimum commitment not met		25.00%
Purchase commitment amount		$ 1,000,000,000
Minimum [Member]
Commitments [Line Items]
Purchase commitment amount	$ 975,000
Joint Venture [Member]
Commitments [Line Items]
Commitment term		10 years