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Commitments and Contingencies - Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]      
Payments under finance leases $ 4    
Short-term lease commitment amount 38    
Operating leases, rent expense 30 $ 34 $ 29
Operating Leases      
2020 31    
2020 28    
2021 28    
2022 23    
2023 18    
Thereafter 17    
Total undiscounted lease payments 145    
Less: Imputed interest (26)    
Total Lease liabilities 119    
Finance Lease, Liability, Payment, Due [Abstract]      
2020 21    
2021 21    
2022 21    
2023 2    
2024 0    
Thereafter 0    
Total undiscounted lease payments 65    
Less: Imputed interest (3)    
Total Lease liabilities $ 62