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Leases - Other Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating cash flows for operating leases $ 23 $ 22  
Operating cash flows for operating leases 6 4  
Financing cash flows for finance leases $ 70 $ 33 $ 5