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Leases - Schedule Of Lease-Related Assets And Liabilities (Detail)
$ in Millions
Mar. 31, 2019
USD ($)
Assets:  
Operating leases $ 1,812
Finance leases 590
Total lease assets 2,402
Liabilities  
Operating leases 310
Finance leases 39
Operating leases 1,494
Finance leases 519
Total lease liabilities $ 2,362
Weighted-average remaining term:  
Operating leases 12 years 3 months 18 days
Finance leases 9 years 2 months 12 days
Weighted-average discount rate:  
Operating leases 5.60% [1]
Finance leases 5.40%
[1] Upon adoption of the new lease standard, discount rates used for existing leases were established at January 1, 2019.