Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Operating Leases:
Operating Lease ROU Assets	$ 738	$ 668
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets, net of accumulated amortization of $1,392 and $1,216 at December 31, 2022 and 2021, respectively	Other assets, net of accumulated amortization of $1,392 and $1,216 at December 31, 2022 and 2021, respectively
Finance Leases:
Property and equipment	$ 9,639	$ 9,757
Less accumulated depreciation and amortization	(4,274)	(4,204)
Property and equipment, net	5,365	5,553
Current finance lease liabilities	$ 3	$ 8
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	$ 220	$ 233
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	$ 273	$ 314
Less accumulated depreciation and amortization	(56)	(54)
Property and equipment, net	217	260
Finance Lease ROU Assets | Land and Improvements
Finance Leases:
Property and equipment		8
Finance Lease ROU Assets | Building and Improvements
Finance Leases:
Property and equipment	261	289
Finance Lease ROU Assets | Equipment and Fixtures
Finance Leases:
Property and equipment	$ 12	$ 17