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SUPPLEMENTAL FINANCIAL INFORMATION
 9 Months Ended
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
SUPPLEMENTAL FINANCIAL INFORMATION SUPPLEMENTAL FINANCIAL INFORMATION
Interest Expense, Net
Three months ended
September 30,		Nine months ended
September 30,
(in millions)2021202020212020
Interest expense, net of capitalized interest$54 $42 $128 $112 
Interest income(4)(3)(10)(16)
Interest expense, net$50 $39 $118 $96 
Other Expense, Net
Three months ended
September 30,		Nine months ended
September 30,
(in millions)2021202020212020
Foreign exchange (gains) losses, net$— $23 $5 $44 
Pension and other postretirement benefit plans4 — 11 (2)
Change in fair value of marketable equity securities9 (9)2 (9)
Other, net(1)2 (3)(1)
Other expense, net$12 $16 $15 $32 
Allowance for Doubtful Accounts
The following table is a summary of the changes in our allowance for doubtful accounts for the three and nine months ended September 30, 2021 and 2020.
Three months ended
September 30,		Nine months ended
September 30,
(in millions)2021202020212020
Balance at beginning of period$117 $120 $125 $112 
Adoption of new accounting standard— — — 4 
Charged to costs and expenses2 3 (1)15 
Write-offs(2)(3)(3)(4)
Currency translation adjustments(2)2 (6)(5)
Balance at end of period$115 $122 $115 $122 
Inventories
(in millions)September 30,
2021		December 31,
2020
Raw materials$479 $460 
Work in process219 196 
Finished goods1,327 1,260 
Inventories$2,025 $1,916 
Property, Plant and Equipment, Net
(in millions)September 30,
2021		December 31,
2020
Property, plant and equipment, at cost$11,171 $11,271 
Accumulated depreciation(6,589)(6,549)
Property, plant and equipment, net$4,582 $4,722 
Non-Cash Operating and Investing Activities
Right-of-use operating lease assets obtained in exchange for lease obligations for the nine months ended September 30, 2021 and 2020 were $69 million and $42 million, respectively. Right-of-use finance lease assets obtained in exchange for lease obligations for the nine months ended September 30, 2020 were $7 million.
Purchases of property, plant and equipment included in accounts payable as of September 30, 2021 and 2020 were $49 million and $48 million, respectively.