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SUPPLEMENTAL FINANCIAL INFORMATION
 3 Months Ended
Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
SUPPLEMENTAL FINANCIAL INFORMATION SUPPLEMENTAL FINANCIAL INFORMATION
Allowance for Doubtful Accounts
The following table is a summary of the changes in our allowance for doubtful accounts for the three months ended March 31, 2022 and 2021.
Three months ended
March 31,
(in millions)20222021
Balance at beginning of period$122 $125 
Charged to costs and expenses6 1 
Write-offs(1)— 
Currency translation adjustments2 (6)
Balance at end of period$129 $120 
Inventories
(in millions)March 31,
2022		December 31,
2021
Raw materials$656 $591 
Work in process285 300 
Finished goods1,607 1,562 
Inventories$2,548 $2,453 
Property, Plant and Equipment, Net
(in millions)March 31,
2022		December 31,
2021
Property, plant and equipment, at cost$11,757 $11,728 
Accumulated depreciation(6,643)(6,550)
Property, plant and equipment, net$5,114 $5,178 
Interest Expense, Net
Three months ended
March 31,
(in millions)20222021
Interest expense, net of capitalized interest$88 $37 
Interest income(3)(3)
Interest expense, net$85 $34 
Other (Income) Expense, Net
Three months ended
March 31,
(in millions)20222021
Foreign exchange (gains) losses, net$(11)$(3)
Pension and other postretirement benefit plans(5)4 
Other, net— 4 
Other (income) expense, net$(16)$5 
Non-Cash Operating and Investing Activities
Right-of-use operating lease assets obtained in exchange for lease obligations for the three months ended March 31, 2022 and 2021 were $14 million and $5 million, respectively.
Purchases of property, plant and equipment included in accounts payable as of March 31, 2022 and 2021 were $53 million and $63 million, respectively.
There were no unsettled share repurchases as of March 31, 2022. Unsettled share repurchases included in accrued expenses and other current liabilities were $47 million as of March 31, 2021.