Accounting Policies and Supplemental Disclosures - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest on debt, net of capitalized interest	$ 523	$ 680	$ 759	$ 949	$ 1,668	$ 2,201
Cash paid for operating leases	3,758	2,844	7,320	6,176	13,485	11,634
Cash paid for interest on finance leases	72	72	143	146	284	296
Cash paid for interest on financing obligations	52	50	107	114	212	210
Cash paid for income taxes, net of refunds	4,761	5,700	5,638	6,158	11,788	12,983
Assets acquired under operating leases	4,621	3,911	8,942	7,664	16,702	13,986
Property and equipment acquired under finance leases, net of remeasurements and modifications	937	181	991	223	1,622	617
Increase (decrease) in property and equipment acquired but not yet paid	$ (1,600)	$ 2,760	$ 1,508	$ 3,171	$ 5,376	$ 3,791