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Financing Activities - Interest Expense (Details) - Convertible Debt - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Debt Instrument [Line Items]        
Non-cash amortization of debt issuance costs $ 3 $ 3 $ 8 $ 9
Contractual coupon interest 5 5 15 18
Total interest expense $ 8 $ 8 $ 23 $ 27