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Derivative Instruments - Forward Currency Exchange Contracts (Details) - Foreign Exchange Contract $ in Millions, € in Billions	3 Months Ended	9 Months Ended
	Mar. 31, 2026 USD ($)	Sep. 30, 2025	Mar. 31, 2026 EUR (€)	Dec. 31, 2025 USD ($)	Dec. 31, 2025 EUR (€)
Derivative [Line Items]
Derivative, notional amount	$ 7,569			$ 8,776
Maximum Remaining Maturity of Foreign Currency Derivatives	8 years 6 months	8 years 8 months 12 days
Total fair value	$ (20)			(124)
Other current assets
Derivative [Line Items]
Derivative assets	73			44
Other noncurrent assets
Derivative [Line Items]
Derivative assets	9			2
Other current liabilities
Derivative [Line Items]
Derivative liabilities	(73)			(102)
Other noncurrent liabilities
Derivative [Line Items]
Derivative liabilities	(29)			(68)
Non-Designated
Derivative [Line Items]
Derivative, notional amount	3,744			4,391
Total fair value	39			(10)
Non-Designated \| Other current assets
Derivative [Line Items]
Derivative assets	49			11
Non-Designated \| Other noncurrent assets
Derivative [Line Items]
Derivative assets	0			0
Non-Designated \| Other current liabilities
Derivative [Line Items]
Derivative liabilities	(10)			(21)
Non-Designated \| Other noncurrent liabilities
Derivative [Line Items]
Derivative liabilities	0			0
Cash Flow \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	1,242			1,738
Total fair value	7			23
Cash Flow \| Designated as Hedging Instrument \| Other current assets
Derivative [Line Items]
Derivative assets	24			33
Cash Flow \| Designated as Hedging Instrument \| Other noncurrent assets
Derivative [Line Items]
Derivative assets	0			2
Cash Flow \| Designated as Hedging Instrument \| Other current liabilities
Derivative [Line Items]
Derivative liabilities	(16)			(10)
Cash Flow \| Designated as Hedging Instrument \| Other noncurrent liabilities
Derivative [Line Items]
Derivative liabilities	(1)			(2)
Net Investment \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	2,583		€ 2.3	2,647	€ 2.3
Total fair value	(66)			(137)
Net Investment \| Designated as Hedging Instrument \| Other current assets
Derivative [Line Items]
Derivative assets	0			0
Net Investment \| Designated as Hedging Instrument \| Other noncurrent assets
Derivative [Line Items]
Derivative assets	9			0
Net Investment \| Designated as Hedging Instrument \| Other current liabilities
Derivative [Line Items]
Derivative liabilities	(47)			(71)
Net Investment \| Designated as Hedging Instrument \| Other noncurrent liabilities
Derivative [Line Items]
Derivative liabilities	$ (28)			$ (66)