LEASES - Lease Position (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets
Operating lease assets	$ 7,004	$ 7,036
Finance lease assets	1,338	1,487
Total lease assets	$ 8,342	$ 8,523
Finance lease asset, balance sheet	Property and equipment, net of accumulated depreciation and amortization of $21,707 and $20,370	Property and equipment, net of accumulated depreciation and amortization of $21,707 and $20,370
Liabilities
Current operating lease liabilities	$ 759	$ 714
Current finance lease liabilities	358	304
Long-term lease obligations	6,468	6,866
Noncurrent finance lease liabilities	1,086	1,345
Total lease liabilities	$ 8,671	$ 9,229
Finance lease liability, current, balance sheet	Current maturities of debt and finance leases	Current maturities of debt and finance leases
Finance lease liability, noncurrent, balance sheet	Debt and finance leases	Debt and finance leases
Operating leases, weighted-average remaining lease term	13 years	13 years
Finance leases, weighted-average remaining lease term	4 years	5 years
Operating leases, weighted-average discount rate	3.73%	4.30%
Finance leases, weighted-average discount rate	3.12%	3.05%