Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Operating Lease, Expense	$ 463	$ 475	$ 525
Operating cash flows used in the measurement of operating lease liabilities	421	399	490
Operating lease right-of-use assets obtained in exchange for operating lease obligations	373	359	$ 535
2024	371
2025	314
2026	268
2027	223
2028	181
Thereafter	640
Total undiscounted lease payments	1,997
Less imputed interest	(237)
Operating Lease, Liability	1,760	1,942
Operating Lease, Liability, Current	348	356
Operating lease liabilities, non-current	$ 1,412	$ 1,586
Operating Lease, Weighted Average Remaining Lease Term	9 years	9 years
Operating Lease, Weighted Average Discount Rate, Percent	3.50%	3.30%