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Goodwill and Long-Lived Assets - Amortization Expense (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization expense three months ended 2020 $ 19 $ 41
Amortization expense remainder of 2020 (estimated) 40 40
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2021 73 73
2022 68 68
2023 66 66
2024 59 59
2025 $ 51 $ 51