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Fair Value of Financial Instruments - NAV (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments in unconsolidated affiliates $ 1,816 $ 1,294
Fair Value Measured at Net Asset Value    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Equity securities (NAV) 35 0
Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments in unconsolidated affiliates 149 146
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Fair Value Measured at Net Asset Value    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments in unconsolidated affiliates $ 1,667 $ 1,148