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Provisions and other non-current liabilities (Tables)
 12 Months Ended
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]  
Disclosure of provisions and other non-current liabilities
The below table provides details related to Provisions and other non-current liabilities as of December 31, 2020, and 2019.
($ millions)Note20202019
Accrued liability for employee benefits:
Defined benefit pension plans23339 291 
Other long-term employee benefits and deferred compensation152 140 
Other post-employment benefits23332 423 
Provisions for litigation and other legal matters— — 
Contingent consideration18142 208 
Other non-current liabilities95 106 
Total provisions and other non-current liabilities1,060 1,168 
Disclosure of details of non-current product liabilities and other legal matter provisions
Litigation and other legal matters provision movements
($ millions)202020192018
January 1— 42 49 
Additions to provisions9 — 1 
Cash payments(9)(40)(1)
Releases of provisions— (2)(7)
December 31— — 42 
Less current portion— — (42)
Non-current provisions for litigation and other legal matters at December 31— — —