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Investments in Affiliates (Summarized Income Statement Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]      
Revenues $ 78,586 $ 89,876 $ 67,417
Net income 5,294 5,868 6,687
Equity Method Investments [Member]      
Schedule of Equity Method Investments [Line Items]      
Revenues 1,798 1,518 1,393
Equity Method Investments Summarized Financial Information, Operating Income 1,012 704 684
Net income $ 735 $ 463 $ 446