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Derivative Financial Instruments - Kyndryl-Related Transactions (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
	May 19, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Financial Instruments
Disposition of investment (in shares)	22.3
Unrealized gain (loss) on derivative instruments		$ (316)	$ (189)	$ (315)	$ (730)
Cash-Settled Swap
Derivative Financial Instruments
Notional amount	$ 311
Unrealized gain (loss) on derivative instruments			$ 3		$ (85)

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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