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Leases - Balance Sheet Classification of Lease Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Assets    
Operating lease assets $ 575 $ 504
Finance lease assets 487 267
Total lease assets 1,062 771
Current:    
Operating lease liabilities 122 125
Finance lease liabilities 130 104
Noncurrent:    
Operating lease liabilities 615 471
Finance lease liabilities 313 271
Total lease liabilities $ 1,180 $ 971
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other long-term assets Other long-term assets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accounts payable and accrued expenses Accounts payable and accrued expenses
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other long-term liabilities Other long-term liabilities
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property and equipment, net Property and equipment, net
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Short-term and current maturities of long-term debt Short-term and current maturities of long-term debt
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-term debt Long-term debt