Leases - Supplemental Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating cash flows for operating leases	$ 461	$ 462
Operating cash flows for finance leases	12	15
Financing cash flows for finance leases	25	89
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	143	381
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 10	$ 94