Debt (Senior Credit Facilities Narrative) (Details) $ in Millions	Sep. 30, 2020 USD ($)
Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing base	$ 1,250	[1]

[1] The margin for borrowings under the senior unsecured revolving credit facility was 1.5% above LIBOR or EURIBOR at current Company credit ratings.