Accounting Policies and Supplemental Disclosures - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accounting Policies [Abstract]
Cash paid for interest on debt	$ 304	$ 276	$ 932	$ 731	$ 1,299	$ 933
Cash paid for operating leases	1,813	1,812	6,268	5,029	7,961	6,230
Cash paid for interest on finance leases	88	121	290	407	404	535
Cash paid for interest on financing obligations	39	48	152	116	189	147
Cash paid for income taxes, net of refunds	742	750	4,340	3,354	4,674	3,774
Assets acquired under operating leases	6,755	10,447	14,031	19,561	19,839	23,908
Property and equipment acquired under finance leases, net of remeasurements and modifications	131	1,744	358	5,453	1,966	8,149
Property and equipment recognized during the construction period of build-to-suit lease arrangements	526	1,797	2,877	3,877	4,847	4,916
Property and equipment derecognized after the construction period of build-to-suit lease arrangements, with the associated leases recognized as operating	$ 2,195	$ 76	$ 3,307	$ 174	$ 3,363	$ 174