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Intangible Assets, net and Goodwill - Intangible Asset Amortization Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of intangible assets $ 255 $ 306 $ 297
2021 223    
2022 215    
2023 187    
2024 171    
2025 $ 107