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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2024
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, 2024
Valuation allowance for deferred tax assets$153 $126 $41 $238 
Allowance for obsolete inventory parts35 8 — 43 
Allowance for credit losses3 3 — 
(1)
6 
Total$191 $137 $41 $287 
Year Ended December 31, 2023
Valuation allowance for deferred tax assets$90 $69 $6 $153 
Allowance for obsolete inventory parts29 6 — 35 
Allowance for credit losses4 19 20 
(1)
3 
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 5 — 29 
Allowance for credit losses3 16 15 
(1)
4 
Total$100 $51 $28 $123 
 
(1)Uncollectible accounts written off, net of recoveries.