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Leases - Supplemental balance sheet information (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Operating leases:    
Operating lease right-of-use assets (included in Other assets) $ 116 $ 138
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other Assets, Noncurrent Other Assets, Noncurrent
Current operating lease liabilities (included in Other current liabilities) $ 38 $ 45
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current Other Liabilities, Current
Noncurrent operating lease liabilities (included in Other long-term liabilities) $ 78 $ 93
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent Other Liabilities, Noncurrent
Total operating lease liabilities $ 116 $ 138
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other Liabilities, Current, Other Liabilities, Noncurrent Other Liabilities, Current, Other Liabilities, Noncurrent
Finance leases:    
Property, plant and equipment $ 155 $ 154
Accumulated amortization (51) (42)
Net property, plant and equipment 104 112
Current finance lease liabilities (included in Long-term debt due within one year) $ 14 $ 16
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Long-term Debt, Current Maturities Long-term Debt, Current Maturities
Noncurrent finance lease liabilities (included in Long-term debt) $ 84 $ 92
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long-term Debt, Excluding Current Maturities Long-term Debt, Excluding Current Maturities
Total finance lease liabilities $ 98 $ 108
Finance Lease, Liability, Statement of Financial Position [Extensible List] Long-term Debt, Current Maturities, Long-term Debt, Excluding Current Maturities Long-term Debt, Current Maturities, Long-term Debt, Excluding Current Maturities
Weighted-average remaining lease term (in years):    
Operating leases weighted-average remaining lease term (in years) 5 years 1 month 6 days 4 years 9 months 18 days
Finance leases weighted-average remaining lease term (in years) 6 years 2 months 12 days 6 years 10 months 24 days
Weighted-average discount rate:    
Operating leases (as a percent) 3.61% 3.69%
Finance leases (as a percent) 2.58% 2.73%