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Other Long-Term Assets, Net - Amortization Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Assets [Abstract]      
Amortization expense for finite-lived intangible assets $ 76 $ 66 $ 54
Estimated amortization expense related to finite-lived intangible assets for the next five years      
2020 77    
2021 73    
2022 74    
2023 69    
2024 $ 67