Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Changes of AOCI by Component

Changes in Accumulated other comprehensive loss by component are as follows:

($ in millions)	Employee Benefit Plans		Cumulative Translation Adjustment		Accumulated Other Comprehensive Income (Loss)
Balance at January 1, 2019, net of taxes	$	(294)	$	(614)	$	(908)
Other comprehensive income (loss), pretax	(68)		54		(14)
Tax	8		—		8
Other comprehensive income (loss), net of taxes	(60)		54		(6)
Balance at December 31, 2019, net of taxes	$	(354)	$	(560)	$	(914)
Other comprehensive income (loss), pretax	(172)		(30)		(202)
Tax	29		—		29
Other comprehensive income (loss), net of taxes	(143)		(30)		(173)
Net Transfer of benefit plans to Merck affiliates	$	465	$	—	$	465
Balance at December 31, 2020, net of taxes	$	(32)	$	(590)	$	(622)
Other comprehensive income (loss), pretax	21		90		111
Tax	(13)		—		(13)
Other comprehensive income (loss), net of taxes	8		90		98
Net transfer of benefit plans to Merck affiliates	11		—		11
Balance at December 31, 2021, net of taxes	$	(13)	$	(500)	$	(513)