Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Operating Leases:
Operating Lease ROU Assets	$ 635	$ 642
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets, net	Other assets, net
Finance Leases:
Property and equipment	$ 9,410	$ 9,352
Less accumulated depreciation and amortization	(4,085)	(4,030)
Property and equipment, net	5,325	5,322
Current finance lease liabilities	$ 9	$ 5
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Current maturities of long-term debt	Current maturities of long-term debt
Long-term finance lease liabilities	$ 82	$ 74
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	$ 164	$ 150
Less accumulated depreciation and amortization	(49)	(46)
Property and equipment, net	115	104
Finance Lease ROU Assets \| Land and Improvements
Finance Leases:
Property and equipment	8	8
Finance Lease ROU Assets \| Building and Improvements
Finance Leases:
Property and equipment	143	134
Finance Lease ROU Assets \| Equipment and Fixtures
Finance Leases:
Property and equipment	$ 13	$ 8

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

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Amount of lessee's right to use underlying asset under operating lease.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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