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Leases - Lease-Related Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Assets    
Operating lease assets $ 729 $ 804
Finance lease assets 3 131
Total lease assets $ 732 $ 935
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization
Current:    
Operating lease liabilities $ 106 $ 113
Finance lease liabilities $ 1 $ 37
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Long-term Debt and Lease Obligation, Current Long-term Debt and Lease Obligation, Current
Long-term:    
Operating lease liabilities $ 690 $ 752
Finance lease liabilities 2 26
Total lease liabilities $ 799 $ 928
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long-term debt and finance lease obligations Long-term debt and finance lease obligations
Weighted average remaining lease term (in years)    
Operating leases 9 years 9 years
Finance leases 2 years 2 years
Weighted average discount rate    
Operating leases 6.00% 5.99%
Finance leases 6.09% 4.60%