Acquisition - Additional Information (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2017	Jun. 30, 2017	Dec. 29, 2017
Business Acquisition [Line Items]
BusinessCombinationConsiderationTransferredEquityInterestsRecognizedAsIncreaseToAdditionalPaidInCapitalCommonStock			$ 6,500,000,000
Proceeds from issuance of equity securities		$ 4,800,000,000
Transition tax payable	$ 220,000,000
BusinessCombinationConsiderationTransferredEquityInterestsRecognizedAsIncreaseToTreasuryStock			$ 2,100,000,000
CR Bard Inc [Member]
Business Acquisition [Line Items]
Business Combination Cash Consideration Transferred Per Share			$ 222.93
Business Combination Equity Interest Issued or Issuable Number of Securities Called by Each Share			0.5077
Proceeds from Issuance of Debt		$ 9,600,000,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability			$ 1,560,000,000
Business Combination, Acquisition Related Costs	$ 44,000,000
Customer Relationships [Member] | CR Bard Inc [Member]
Business Acquisition [Line Items]
Fair Value Inputs, Discount Rate	8.00%
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Customer relationships | CR Bard Inc [Member]
Business Acquisition [Line Items]
Fair Value Inputs, Discount Rate	8.00%
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years