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Leases Lessee, Operating Lease, Liability, Maturity (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Leases [Abstract]  
2019 $ 114
2020 124
2021 86
2022 58
2023 40
Thereafter 73
Total lease payments 495
Less imputed interest 63
Present value of lease liabilities $ 432