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Intangible Assets (Schedule of Estimated Amortization of Intangibles for the Next Five Years) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Estimated Amortization of Intangibles  
2021 $ 2,378
2022 2,226
2023 2,035
2024 1,836
2025 $ 1,667