Hedging Activities and Fair Value Measurements - Effect of Hedging Relationships on Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	$ 0	$ 0	$ 0	$ 0
Forward currency contracts \| Cash flow hedge \| Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax			21,000,000
Forward currency contracts \| Cash flow hedge \| Designated Hedging Instruments \| Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	15,000,000	(255,000,000)	114,000,000	(325,000,000)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(3,000,000)	57,000,000	(26,000,000)	73,000,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	12,000,000	(198,000,000)	88,000,000	(252,000,000)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	4,000,000	(21,000,000)	7,000,000	(61,000,000)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	(1,000,000)	5,000,000	(2,000,000)	14,000,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	3,000,000	(16,000,000)	5,000,000	(48,000,000)
Forward currency contracts \| Net investment hedge \| Location, Statement of Income, Balance [Axis]: us-gaap:InterestExpense
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax			23,000,000
Forward currency contracts \| Net investment hedge \| Designated Hedging Instruments \| Location, Statement of Income, Balance [Axis]: us-gaap:InterestExpense
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	19,000,000	(61,000,000)	36,000,000	(78,000,000)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax	(4,000,000)	14,000,000	(8,000,000)	18,000,000
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	14,000,000	(47,000,000)	28,000,000	(60,000,000)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax	(8,000,000)	(9,000,000)	(11,000,000)	(14,000,000)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax	2,000,000	2,000,000	2,000,000	3,000,000
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, after Tax	(6,000,000)	(7,000,000)	(8,000,000)	(11,000,000)
Foreign currency-denominated debt \| Net investment hedge \| Designated Hedging Instruments \| Location, Statement of Income, Balance [Axis]: bsx:OtherNonoperatingIncomeExpenseNet
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	11,000,000	(81,000,000)	32,000,000	(119,000,000)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax	(2,000,000)	18,000,000	(7,000,000)	27,000,000
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	8,000,000	(63,000,000)	25,000,000	(93,000,000)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax	0	0	0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax	0	0	0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, after Tax	$ 0	$ 0	$ 0	$ 0

Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount, after tax and before adjustments, of gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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