Short-Term Borrowings (Narrative) (Details) $ in Thousands		3 Months Ended
	Nov. 30, 2021 USD ($) contract	Mar. 31, 2022	Mar. 31, 2018 USD ($)
Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 2,000,000
Number of revolving credit facilities extension options | contract	2
Extension period for revolving line of credit		1 year
Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Possible additional increase in borrowing capacity amount	$ 100,000
Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Possible additional increase in borrowing capacity amount	$ 400,000
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 2,000,000