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Investments in Subsidiaries (Non-Controlling Interests in Subsidiaries - Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments in subsidiaries and investee companies [Line Items]        
Current assets $ 3,909 $ 2,841    
Non-current assets 7,171 6,823    
Current liabilities (2,612) (2,177)    
Non-current liabilities (3,732) (3,399)    
Equity (4,736) (4,088) $ (4,061) $ (3,915)
Non-controlling interests [Member]        
Investments in subsidiaries and investee companies [Line Items]        
Current assets 231 149    
Non-current assets 408 400    
Current liabilities (168) (189)    
Non-current liabilities (83) (76)    
Equity $ (388) $ (284)