Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Operating Leases:
Operating lease right-of-use assets	$ 695	$ 738
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets, net	Other assets, net
Finance Leases:
Property and equipment	$ 9,527	$ 9,639
Less accumulated depreciation and amortization	(4,277)	(4,274)
Property and equipment, net	5,250	5,365
Current finance lease liabilities	$ 2	$ 3
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current maturities of long-term debt	Current maturities of long-term debt
Long-term finance lease liabilities	$ 214	$ 220
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term debt	Long-term debt
Finance Lease ROU Assets
Finance Leases:
Property and equipment	$ 270	$ 273
Less accumulated depreciation and amortization	(58)	(56)
Property and equipment, net	212	217
Finance Lease ROU Assets | Building and Improvements
Finance Leases:
Property and equipment	261	261
Finance Lease ROU Assets | Equipment and Fixtures
Finance Leases:
Property and equipment	$ 9	$ 12