Accounting Policies and Supplemental Disclosures - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest on debt, net of capitalized interest	$ 266	$ 465	$ 1,215	$ 1,821	$ 2,002	$ 2,450
Cash paid for operating leases	2,940	2,692	9,116	7,687	11,882	10,052
Cash paid for interest on finance leases	71	76	217	234	291	318
Cash paid for interest on financing obligations	47	50	161	150	207	205
Cash paid for income taxes, net of refunds	2,004	2,628	8,162	6,982	12,359	8,677
Assets acquired under operating leases	3,571	3,345	11,235	11,075	14,212	15,844
Property and equipment acquired under finance leases, net of remeasurements and modifications	186	183	409	431	620	748
Property and equipment recognized during the construction period of build-to-suit lease arrangements	21	93	89	308	138	618
Property and equipment derecognized after the construction period of build-to-suit lease arrangements, with the associated leases recognized as operating	$ 0	$ 492	$ 0	$ 1,212	$ 162	$ 3,063