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Leases - Schedule Of Lease-Related Assets And Liabilities (Detail)
$ in Millions
Sep. 30, 2019
USD ($)
Assets:  
Operating leases $ 1,770
Finance leases 486
Total lease assets 2,256
Liabilities  
Operating leases 344
Finance leases 89
Operating leases 1,440
Finance leases 451
Total lease liabilities $ 2,324
Weighted-average remaining term:  
Operating leases 10 years 9 months 18 days
Finance leases 10 years 7 months 6 days
Weighted-average discount rate:  
Operating leases 5.40% [1]
Finance leases 6.10%
[1] Upon adoption of the new lease standard, discount rates used for existing leases were established at January 1, 2019.