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Debt (Interest Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Debt (Interest Expense) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Interest Expense
Amortization			$ 39	$ 38
Bifurcated compound exchange feature			(153)	272
Total	$ 80	$ 232	271	649
Exchangeable bonds
Interest Expense
Contractual interest	6	6	16	19
Amortization	5	5	15	15
Bifurcated compound exchange feature	(74)	93	(153)	272
Total	$ (63)	$ 104	$ (122)	$ 306

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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