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Revenue Recognition (Deferred Contract Acquisition and Fulfillment Costs) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Deferred Acquisition Costs      
Capitalized Contract Cost, Net [Abstract]      
Total deferred costs $ 7,259   $ 7,310
Deferred cost amortization 2,733 $ 2,568  
Deferred Acquisition Costs | Prepaid and other current assets      
Capitalized Contract Cost, Net [Abstract]      
Total deferred costs 3,185   3,233
Deferred Acquisition Costs | Other Assets      
Capitalized Contract Cost, Net [Abstract]      
Total deferred costs 4,074   4,077
Deferred Fulfillment Costs      
Capitalized Contract Cost, Net [Abstract]      
Total deferred costs 5,554   6,183
Deferred cost amortization 1,916 $ 2,031  
Deferred Fulfillment Costs | Prepaid and other current assets      
Capitalized Contract Cost, Net [Abstract]      
Total deferred costs 2,155   2,340
Deferred Fulfillment Costs | Other Assets      
Capitalized Contract Cost, Net [Abstract]      
Total deferred costs $ 3,399   $ 3,843