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Leases - Operating Leases, Lessor, Future Undiscounted Cash Flows, and Income (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Operating lease payments receivable  
2020 $ 10
2021 10
2022 10
2023 9
2024 and thereafter 0
Total 39
Operating lease income $ 1