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Financing Arrangements - Carrying Amount of Convertible Debt (Details) - USD ($)
Dec. 31, 2022
Sep. 30, 2022
Less:    
Long-term Debt $ 3,302,000,000 $ 3,170,000,000
Weighted average contractual interest rate of debt 8.00% 7.40%
Convertible Notes    
Debt Instrument [Line Items]    
Principal $ 350,000,000 $ 221,000,000
Less:    
Unamortized debt discount 0 (10,000,000)
Unamortized issuance costs (1,000,000) (1,000,000)
Long-term Debt $ 220,000,000 $ 210,000,000