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Indebtedness - Narrative (Details) - USD ($)
$ in Millions
5 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Loss on repurchase of debt $ 0 $ 0 $ 138 $ 0
Unsecured Senior Notes        
Debt Instrument [Line Items]        
Maximum percentage redeemable on secured debt     40.00%  
Unsecured Senior Notes        
Debt Instrument [Line Items]        
Repayments of debt     $ 100 $ 100
Amount of principal redeemed     2,298  
Loss on repurchase of debt     $ 138  
Minimum | Secured Debt | HECM Securitizations        
Debt Instrument [Line Items]        
Weighted average useful life     1 year  
Maximum | Secured Debt | HECM Securitizations        
Debt Instrument [Line Items]        
Weighted average useful life     3 years