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Indebtedness - Narrative (Details) - Unsecured Senior Notes - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Debt Instrument [Line Items]    
Maximum percentage redeemable on unsecured debt 40.00%  
Repayments of debt   $ 100
Amount of principal amount outstanding repaid   598
Gain on redemption of unsecured senior notes   $ 1