Accounting Policies and Supplemental Disclosures - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accounting Policies [Abstract]
Cash paid for interest on debt	$ 349	$ 179	$ 628	$ 455	$ 1,271	$ 942
Cash paid for operating leases	2,088	1,577	4,455	3,217	7,960	5,577
Cash paid for interest on finance leases	95	129	202	286	437	569
Cash paid for interest on financing obligations	55	35	113	68	198	127
Cash paid for income taxes, net of refunds	3,145	1,803	3,598	2,604	4,682	3,526
Assets acquired under operating leases	5,101	5,578	7,276	9,114	23,531	19,576
Property and equipment acquired under finance leases, net of remeasurements and modifications	61	1,642	227	3,709	3,579	9,976
Property and equipment recognized during the construction period of build-to-suit lease arrangements	986	1,193	2,351	2,080	6,117	3,486
Property and equipment derecognized after the construction period of build-to-suit lease arrangements, with the associated leases recognized as operating	$ 1,079	$ 99	$ 1,112	$ 99	$ 1,243	$ 99