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Indebtedness - Schedule of Notes Maturity (Details) - Unsecured Senior Notes - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
2022 through 2026 $ 0  
Thereafter 2,700  
Total unsecured senior notes principal amount $ 2,700 $ 2,100