Leases - Schedule Of Lease-Related Assets And Liabilities (Detail) $ in Millions	Dec. 31, 2019 USD ($)
Assets:
Operating leases	$ 1,834
Finance leases	520
Total lease assets	2,354
Liabilities
Operating leases	350
Finance leases	87
Operating leases	1,499
Finance leases	470
Total lease liabilities	$ 2,406
Weighted-average remaining term:
Operating leases	10 years 9 months 18 days
Finance leases	12 years
Weighted-average discount rate:
Operating leases	5.30%	[1]
Finance leases	6.00%

[1] Upon adoption of the new lease standard, discount rates used for existing leases were established at January 1, 2019.