Guarantees and Commitments - Schedule of Long-Term Standby Purchase Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
LTSPCs
Guarantor Obligations [Line Items]
Maximum principal amount	$ 3,191,061	$ 2,881,856
Weighted-average remaining maturity	15 years 6 months	15 years 3 months 18 days
Guarantee and commitment obligation
Guarantor Obligations [Line Items]
Maximum principal amount	$ 3,800,000	$ 3,300,000
Guarantee and commitment obligation | LTSPCs
Guarantor Obligations [Line Items]
Guarantee and commitment obligation	$ 36,571	$ 33,909