v3.24.0.1
Schedule II - Valuation and Qualifying Accounts
12 Months Ended
Dec. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS
(in millions)
Balance at
beginning of
period
Additions Charged to
Costs and
Expenses
Deductions Balance at
end of
period
Year Ended December 31, 2023
Valuation allowance for deferred tax assets$90 $69 $$153 
Allowance for obsolete inventory parts29 — 35 
Allowance for doubtful accounts19 20 
(1)
Total$123 $94 $26 $191 
Year Ended December 31, 2022
Valuation allowance for deferred tax assets$73 $30 $13 $90 
Allowance for obsolete inventory parts24 — 29 
Allowance for doubtful accounts16 15 
(1)
Total$100 $51 $28 $123 
Year Ended December 31, 2021
Valuation allowance for deferred tax assets$69 $19 $15 $73 
Allowance for obsolete inventory parts27 24 
Allowance for doubtful accounts14 13 
(1)
Total$98 $37 $35 $100 
 
(1)Uncollectible accounts written off, net of recoveries.