Debt - Credit Facility (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Commercial Paper	$ 0	$ 0
Variable rate unsecured credit facility
Line of Credit Facility [Line Items]
Available borrowing capacity	2,250,000,000	2,250,000,000
Commercial Paper	0	0
Letters of Credit Outstanding, Amount	(1,914,000)	(1,914,000)
Amount available under the Credit Facility	2,248,086,000	2,248,086,000
Additional letters of credit
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount	$ (58,116,000)	$ (48,740,000)