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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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Interest Expense
Amortization			$ 36	$ 39
(Gain) loss on adjustment to bifurcated compound exchange feature			(51)	(153)
Total	$ 154	$ 80	382	271
Exchangeable bonds
Interest Expense
Contractual interest	3	6	14	16
Amortization	4	5	15	15
(Gain) loss on adjustment to bifurcated compound exchange feature	14	(74)	(51)	(153)
Total	$ 21	$ (63)	$ (22)	$ (122)

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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