Notes Payable - Unsecured Senior Notes (Details) - Unsecured Senior Notes $ in Millions	Jun. 30, 2022 USD ($) tranche
Debt Instrument [Line Items]
Debt amount	$ 1,000
Number of tranches | tranche	5
4.09% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 100
Interest rate	4.09%
3.91% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 250
Interest rate	3.91%
3.78% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 125
Interest rate	3.78%
3.86% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 250
Interest rate	3.86%
3.95% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 275
Interest rate	3.95%