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Derivative Financial Instruments - Kyndryl-Related Transactions (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
	May 19, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Financial Instruments
Disposition of investment (in shares)	22.3
(Gains)/losses on derivative instruments		$ 141	$ 439	$ (1)	$ 541
Cash-Settled Swap
Derivative Financial Instruments
Notional amount	$ 311
(Gains)/losses on derivative instruments			$ 88		$ 88

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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