Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows paid for operating leases	$ 2,733	$ 2,756	$ 2,689
Operating cash flows paid for interest portion of finance leases	71	73	68
Financing cash flows paid for principal portion of finance leases	74	70	62
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	852	1,132	591
Finance leases	$ 30		$ 232
Finance leases		$ (4)