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Investments in Unconsolidated Affiliates - Additional Information (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Affiliate
Dec. 31, 2020
USD ($)
Schedule Of Investments [Line Items]    
Equity method investment, ownership percentage 20.00%  
Number of unconsolidated affiliates | Affiliate 2  
Debt [1] $ 2,929 $ 1,159
Investments in unconsolidated affiliates $ 56 51
BRE Ace LLC    
Schedule Of Investments [Line Items]    
Equity method investment, ownership percentage 25.00%  
1776 Holdings LLC    
Schedule Of Investments [Line Items]    
Equity method investment, ownership percentage 50.00%  
BRE Ace LLC and 1776 Holding, LLC    
Schedule Of Investments [Line Items]    
Debt $ 421 $ 454
[1] As of September 30, 2021 and December 31, 2020, weighted-average interest rates were 4.108 percent and 3.357 percent, respectively.