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Fair Value of Financial Instruments - NAV (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments in unconsolidated affiliates $ 2,849 $ 2,486
Investments measured under equity method or NAV expedient 2,896 2,534
Fair Value Measured at Net Asset Value    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Equity securities (NAV) 47 48
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 153 136
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 $ 2,696 $ 2,350