Debt - Extinguishments of Debt (Details) € in Millions, $ in Millions	3 Months Ended				12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2021 EUR (€)
Extinguishment of Debt [Line Items]
Long-Term Debt	$ 13,886	$ 17,110			$ 13,886	$ 17,110
Losses on debt extinguishment					24	178	$ 8
bdx:Gain(loss)fromreversetrasurylocks					(17)
3.794% Notes due May 20, 2050
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 190				$ 190
Interest rate	3.794%				3.794%
Long-Term Debt	$ 554	742			$ 554	742
Debt Instrument, Repurchase Amount	163				163
Losses on debt extinguishment	(25)
3.794% Notes due May 20, 2050 | Long-term Debt
Extinguishment of Debt [Line Items]
Long-Term Debt	188				188
7.000% Debentures due August 1, 2027
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 52				$ 52
Interest rate	7.00%				7.00%
Long-Term Debt	$ 119	174			$ 119	174
Debt Instrument, Repurchase Amount	59				59
Losses on debt extinguishment	5
7.000% Debentures due August 1, 2027 | Long-term Debt
Extinguishment of Debt [Line Items]
Long-Term Debt	54				54
6.700% Debentures due August 1, 2028
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 55				$ 55
Interest rate	6.70%				6.70%
Long-Term Debt	$ 116	173			$ 116	173
Debt Instrument, Repurchase Amount	62				62
Losses on debt extinguishment	5
6.700% Debentures due August 1, 2028 | Long-term Debt
Extinguishment of Debt [Line Items]
Long-Term Debt	56				56
6.000% Notes due May 15, 2039
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 127				$ 127
Interest rate	6.00%				6.00%
Long-Term Debt	$ 121	246			$ 121	246
Debt Instrument, Repurchase Amount	145				145
Losses on debt extinguishment	20
6.000% Notes due May 15, 2039 | Long-term Debt
Extinguishment of Debt [Line Items]
Long-Term Debt	125				125
5.000% Notes due November 12, 2040
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 34				$ 34
Interest rate	5.00%				5.00%
Long-Term Debt	$ 90	124			$ 90	124
Debt Instrument, Repurchase Amount	35				35
Losses on debt extinguishment	1
5.000% Notes due November 12, 2040 | Long-term Debt
Extinguishment of Debt [Line Items]
Long-Term Debt	34				34
4.685% Notes due December 15, 2044
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 42				$ 42
Interest rate	4.685%				4.685%
Long-Term Debt	$ 911	1,033			$ 911	1,033
Debt Instrument, Repurchase Amount	42				42
Losses on debt extinguishment	(1)
4.685% Notes due December 15, 2044 | Long-term Debt
Extinguishment of Debt [Line Items]
Long-Term Debt	$ 43				$ 43
Notes 2.894% due June 6, 2022
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount		$ 1,535		$ 265		$ 1,535
Interest rate		2.894%		2.894%		2.894%
Debt Instrument, Repurchase Amount		$ 1,566		$ 275		$ 1,566
Losses on debt extinguishment		32		10
Notes 2.894% due June 6, 2022 | Long-term Debt
Extinguishment of Debt [Line Items]
Long-Term Debt		1,534		$ 265		1,534
Notes 3.300% due March 1, 2023
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount		$ 294				$ 294
Interest rate		3.30%				3.30%
Debt Instrument, Repurchase Amount		$ 307				$ 307
Losses on debt extinguishment		12
Notes 3.300% due March 1, 2023 | Long-term Debt
Extinguishment of Debt [Line Items]
Long-Term Debt		295				295
3.875% Notes due May 15, 2024
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount		$ 33				$ 33
Interest rate	3.875%	3.875%			3.875%	3.875%
Long-Term Debt	$ 145	$ 146			$ 145	$ 146
Debt Instrument, Repurchase Amount		35				35
Losses on debt extinguishment		2
3.875% Notes due May 15, 2024 | Long-term Debt
Extinguishment of Debt [Line Items]
Long-Term Debt		33				33
3.734% Notes due December 15, 2024
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount		$ 500				$ 500
Interest rate	3.734%	3.734%			3.734%	3.734%
Long-Term Debt	$ 873	$ 873			$ 873	$ 873
Debt Instrument, Repurchase Amount		546				546
Losses on debt extinguishment		48
3.734% Notes due December 15, 2024 | Long-term Debt
Extinguishment of Debt [Line Items]
Long-Term Debt		499				499
3.363% Notes due June 6, 2024
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount		$ 752				$ 752
Interest rate	3.363%	3.363%			3.363%	3.363%
Long-Term Debt	$ 996	$ 994			$ 996	$ 994
Debt Instrument, Repurchase Amount		808				808
Losses on debt extinguishment		58
3.363% Notes due June 6, 2024 | Long-term Debt
Extinguishment of Debt [Line Items]
Long-Term Debt		$ 750				$ 750
Notes 3.125% due November 8, 2021
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount			$ 1,000
Interest rate			3.125%					3.125%
Debt Instrument, Repurchase Amount			$ 1,019
Losses on debt extinguishment			14
Notes 3.125% due November 8, 2021 | Long-term Debt
Extinguishment of Debt [Line Items]
Long-Term Debt			$ 1,005
Notes 0.174% due June 4, 2021
Extinguishment of Debt [Line Items]
Interest rate			0.174%					0.174%
Debt Instrument, Repurchase Amount			$ 730
Losses on debt extinguishment			1
Notes 0.174% due June 4, 2021 | Long-term Debt
Extinguishment of Debt [Line Items]
Long-Term Debt			728
Notes 0.174% due June 4, 2021 | Euro Member Countries, Euro
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount | €								€ 600
Notes 0.174% due June 4, 2021 | United States of America, Dollars
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount			$ 728