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Leases - Future Minimum Lease Payments (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Finance lease, undiscounted cash flows    
Finance leases, 04/01/2019 - 03/31/2020 $ 38  
Finance leases, 04/01/2020 - 03/31/2021 34  
Finance leases, 04/01/2021 - 03/31/2022 28  
Finance leases, 04/01/2022 - 03/31/2023 21  
Finance leases, 04/01/2023 - 03/31/2024 17  
Finance leases, 04/01/2024 - beyond 254  
Total lease payments 392  
Less: Interest (108)  
Present value of lease liabilities 284 $ 285
Operating leases, undiscounted cash flows    
Operating leases, 04/01/2019 - 03/31/2020 121  
Operating leases, 04/01/2020 - 03/31/2021 100  
Operating leases, 04/01/2021 - 03/31/2022 84  
Operating leases, 04/01/2022 - 03/31/2023 64  
Operating leases, 04/01/2023 - 03/31/2024 50  
Operating leases, 04/01/2024 - beyond 302  
Total lease payments 721  
Less: Interest (162)  
Present value of lease liabilities $ 559 $ 554