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Restructuring (Tables)
9 Months Ended
Sep. 30, 2021
Restructuring and Related Activities [Abstract]  
Charges Related to Restructuring Program Activities by Type of Cost
The following tables summarize the charges related to restructuring program activities by type of cost:
 Three Months Ended September 30, 2021Nine Months Ended September 30, 2021
($ in millions)Separation
Costs
Accelerated
Depreciation
OtherTotalSeparation
Costs
Accelerated
Depreciation
OtherTotal
Cost of sales$— $11 $37 $48 $— $32 $81 $113 
Selling, general and administrative— — 
Research and development— — 20 21 
Restructuring costs17 — 90 107 310 — 177 487 
$17 $22 $129 $168 $310 $60 $260 $630 
 Three Months Ended September 30, 2020Nine Months Ended September 30, 2020
($ in millions)Separation
Costs
Accelerated
Depreciation
OtherTotalSeparation
Costs
Accelerated
Depreciation
OtherTotal
Cost of sales$— $33 $$38 $— $89 $42 $131 
Selling, general and administrative— 15 — 15 — 37 — 37 
Research and development— 18 19 — 66 67 
Restructuring costs61 — 52 113 143 — 122 265 
$61 $66 $58 $185 $143 $192 $165 $500 
Charges and Spending Relating to Restructuring Activities by Program
The following table summarizes the charges and spending relating to restructuring program activities for the nine months ended September 30, 2021:
($ in millions)Separation
Costs
Accelerated
Depreciation
OtherTotal
Restructuring reserves January 1, 2021
$567 $— $19 $586 
Expense310 60 260 630 
(Payments) receipts, net(305)— (155)(460)
Non-cash activity— (60)(84)(144)
Restructuring reserves September 30, 2021 (1)
$572 $— $40 $612 
(1)The remaining cash outlays are expected to be substantially completed by the end of 2023.