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Goodwill, Other Intangibles, and Property and Equipment - Estimated Annual Pre-Tax Amortization for Intangible Assets (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Goodwill Other Intangibles And Property And Equipment [Abstract]  
2021 $ 2,719
2022 2,236
2023 2,014
2024 1,821
2025 $ 1,760