CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (Loss)/Earnings	$ (80)	$ 1,439	$ (846)	$ 3,154
Derivatives qualifying as cash flow hedges	(59)	(28)	11	(14)
Pension and postretirement benefits	(7)	39	9	88
Available-for-sale debt securities	8	13	9	39
Foreign currency translation	51	(1)	(65)	28
Other Comprehensive (Loss)/Income	(7)	23	(36)	141
Comprehensive (Loss)/Income	(87)	1,462	(882)	3,295
Comprehensive Income Attributable to Noncontrolling Interest	5	7	14	12
Comprehensive (Loss)/Income Attributable to BMS	$ (92)	$ 1,455	$ (896)	$ 3,283