EQUITY - Reclassifications and Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Reclassifications and Taxes Related to Items of Other Comprehensive Income (Loss)
Other comprehensive income (loss)	$ 6	$ 66
Other comprehensive income (loss)
Reclassifications and Taxes Related to Items of Other Comprehensive Income (Loss)
Other comprehensive income (loss), before tax amount	6	66
Other comprehensive income (loss), tax (expense) benefit	(1)
Other comprehensive income (loss)	6	66
Foreign currency translation adjustments
Reclassifications and Taxes Related to Items of Other Comprehensive Income (Loss)
Other comprehensive income (loss), before tax amount	(2)	71
Other comprehensive income (loss)	(2)	71
Foreign currency translation adjustments excluding net investment hedges
Reclassifications and Taxes Related to Items of Other Comprehensive Income (Loss)
Unrealized gains (losses) arising during the period, before tax amount	(16)	222
Unrealized gains (losses) arising during the period, net of tax amount	(16)	222
Unrealized gains (losses) on net investment hedges
Reclassifications and Taxes Related to Items of Other Comprehensive Income (Loss)
Unrealized gains (losses) arising during the period, before tax amount	14	(152)
Unrealized gains (losses) arising during the period, net of tax amount	14	(152)
Unrealized gains (losses) on cash flow hedges
Reclassifications and Taxes Related to Items of Other Comprehensive Income (Loss)
Unrealized gains (losses) arising during the period, before tax amount	6	(10)
Unrealized gains (losses) arising during the period, tax (expense) benefit		1
Unrealized gains (losses) arising during the period, net of tax amount	6	(9)
Reclassification/amortization, before tax amount		2
Reclassification/amortization, net of tax amount	(1)	2
Other comprehensive income (loss), before tax amount	6	(8)
Other comprehensive income (loss), tax (expense) benefit		1
Other comprehensive income (loss)	6	(7)
Total retirement-related benefit plans
Reclassifications and Taxes Related to Items of Other Comprehensive Income (Loss)
Other comprehensive income (loss), before tax amount	2
Other comprehensive income (loss)	2	2
Retirement-related benefit plans, Prior service (costs) credits
Reclassifications and Taxes Related to Items of Other Comprehensive Income (Loss)
Reclassification/amortization, before tax amount	2
Reclassification/amortization, net of tax amount	$ 1
Retirement-related benefit plans, net gains (losses)
Reclassifications and Taxes Related to Items of Other Comprehensive Income (Loss)
Reclassification/amortization, before tax amount		3
Reclassification/amortization, tax (expense) benefit		(1)
Reclassification/amortization, net of tax amount		$ 2

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