Leases - Summary of the Components of Net Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease cost	$ 2,532	$ 2,579	$ 2,633
Finance lease cost:
Amortization of right-of-use assets	84	79	62
Interest on lease liabilities	73	68	62
Total finance lease costs	157	147	124
Short-term lease costs	22	27	25
Variable lease costs	635	610	604
Less: sublease income	(63)	(61)	(59)
Net lease cost	$ 3,283	$ 3,302	$ 3,327