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Goodwill and Other Intangible Assets - Estimated Amortization of Identifiable Intangible Assets (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2020 $ 702
2021 527
2022 431
2023 341
2024 273
Thereafter $ 868