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Goodwill and Intangible Assets - Schedules for Amortization Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Goodwill and Intangible Assets        
Amortization expense for acquired intangible assets $ 134 $ 134 $ 267 $ 268
Expected amortization expense for acquired intangible assets recorded as of balance sheet date        
Remainder of 2021 262   262  
2022 516   516  
2023 487   487  
2024 459   459  
2025 429   429  
2026 421   421  
After 2026 $ 2,342   $ 2,342