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Recent Accounting Pronouncements Recent Accounting Pronouncements - Maturities of Finance Lease Liabilities (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Finance Lease Payments  
2019 (remaining) $ 8
2020 6
2021 5
2022 4
2023 1
Thereafter 0
Total undiscounted finance lease payments 24
Less imputed interest 1
Present value of finance lease liabilities $ 23