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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, 2024 USD ($)	Sep. 30, 2023	Mar. 31, 2024 EUR (€)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)
Derivative [Line Items]
Derivative, notional amount	$ 7,563			$ 7,627
Maximum Remaining Maturity of Foreign Currency Derivatives	2 years 7 months 6 days	2 years 10 months 24 days
Total fair value	$ 99			19
Other current assets
Derivative [Line Items]
Derivative assets	146			114
Other noncurrent assets
Derivative [Line Items]
Derivative assets	9			2
Other current liabilities
Derivative [Line Items]
Derivative liabilities	(27)			(52)
Other noncurrent liabilities
Derivative [Line Items]
Derivative liabilities	(29)			(45)
Non-Designated
Derivative [Line Items]
Derivative, notional amount	4,283			4,315
Total fair value	19			(20)
Non-Designated \| Other current assets
Derivative [Line Items]
Derivative assets	27			16
Non-Designated \| Other noncurrent assets
Derivative [Line Items]
Derivative assets	0			0
Non-Designated \| Other current liabilities
Derivative [Line Items]
Derivative liabilities	(8)			(36)
Non-Designated \| Other noncurrent liabilities
Derivative [Line Items]
Derivative liabilities	0			0
Cash Flow \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	1,659			1,650
Total fair value	11			8
Cash Flow \| Designated as Hedging Instrument \| Other current assets
Derivative [Line Items]
Derivative assets	29			24
Cash Flow \| Designated as Hedging Instrument \| Other noncurrent assets
Derivative [Line Items]
Derivative assets	3			2
Cash Flow \| Designated as Hedging Instrument \| Other current liabilities
Derivative [Line Items]
Derivative liabilities	(19)			(16)
Cash Flow \| Designated as Hedging Instrument \| Other noncurrent liabilities
Derivative [Line Items]
Derivative liabilities	(2)			(2)
Net Investment \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	1,621		€ 1.5	1,662	€ 1.5
Total fair value	69			31
Net Investment \| Designated as Hedging Instrument \| Other current assets
Derivative [Line Items]
Derivative assets	90			74
Net Investment \| Designated as Hedging Instrument \| Other noncurrent assets
Derivative [Line Items]
Derivative assets	6			0
Net Investment \| Designated as Hedging Instrument \| Other current liabilities
Derivative [Line Items]
Derivative liabilities	0			0
Net Investment \| Designated as Hedging Instrument \| Other noncurrent liabilities
Derivative [Line Items]
Derivative liabilities	$ (27)			$ (43)