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Investments in Unconsolidated Subsidiaries and Affiliates - Summary of Investments in Unconsolidated Subsidiaries and Affiliates (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]    
Equity method $ 514 $ 513
Cost method 15 118
Total $ 529 $ 631