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Goodwill and Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 356  
2022 327  
2023 300  
2024 285  
2025 275  
Subsequent years 1,156  
Net Carrying Amount $ 2,699 $ 2,774