Debt - Summary of Collateral Covenants and Cross Default Provisions (Details) - Line of Credit $ in Billions	Dec. 31, 2021 USD ($)
Credit Agreement
Debt Instrument [Line Items]
Unrestricted liquidity required for credit agreement	$ 2.0
Minimum ratio of appraised value of collateral for Credit Agreement	1.6
2026 Notes and 2029 Notes
Debt Instrument [Line Items]
Additional interest required if minimum ratio is not met, percent	2.00%
Minimum ratio of appraised value of collateral for Credit Agreement	1.6