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Equity Method Investments and Variable Interest Entities (Consolidated Summarized Financial Information - Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Current assets $ 2,152 $ 1,634
Total assets 6,199 5,705
Current liabilities 1,875 1,455
Total liabilities 4,498 4,096
Equity Method Investment    
Schedule of Equity Method Investments [Line Items]    
Current assets 2,382 3,216
Noncurrent assets 2,996 3,227
Total assets 5,378 6,443
Current liabilities 955 1,018
Noncurrent liabilities 2,652 2,831
Total liabilities $ 3,607 $ 3,849