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Financial Instruments
 9 Months Ended
Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
FINANCIAL INSTRUMENTS FINANCIAL INSTRUMENTS
Fair Value Measurements
In measuring fair values of assets and liabilities, we use valuation techniques that maximize the use of observable inputs (Level 1) and minimize the use of unobservable inputs (Level 3). We also use market data or assumptions that we believe market participants would use in pricing an asset or liability, including assumptions about risk when appropriate.
The carrying value for certain of our financial instruments, including cash, accounts receivable, current investments, accounts payable and certain other accrued liabilities, approximates fair value because of their short-term nature.
As of September 30, 2025 and December 31, 2024, our assets and liabilities that are measured at fair value on a recurring basis include the following:
September 30, 2025
 Fair Value
 Carrying AmountTotalQuoted
Prices in
Active
Markets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Assets:
Money market mutual funds - restricted cash and marketable securities and other assets$70 $70 $70 $— $— 
Bonds and fixed income - restricted cash and marketable securities and other assets
96 96 — 96 — 
Derivative and hedging assets - other assets36 36 — 36 — 
Total assets$202 $202 $70 $132 $— 
Liabilities:
Derivative and hedging liabilities - other long-term liabilities$51 $51 $— $51 $— 
Contingent consideration - other accrued liabilities and other long-term liabilities64 64 — — 64 
Total liabilities$115 $115 $— $51 $64 
December 31, 2024
 Fair Value
 Carrying AmountTotalQuoted
Prices in
Active
Markets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Assets:
Money market mutual funds - restricted cash and marketable securities and other assets$62 $62 $62 $— $— 
Bonds and fixed income - restricted cash and marketable securities and other assets
90 90 — 90 — 
Derivative and hedging assets - other assets55 55 — 55 — 
Total assets$207 $207 $62 $145 $— 
Liabilities:
Derivative and hedging liabilities - other long-term liabilities$72 $72 $— $72 $— 
Contingent consideration - other accrued liabilities and other long-term liabilities65 65 — — 65 
Total liabilities$137 $137 $— $72 $65 
Total Debt
As of September 30, 2025 and December 31, 2024, the carrying value of our total debt was $13.3 billion and $12.7 billion, respectively, and the fair value of our total debt was $13.2 billion and $12.2 billion, respectively. The estimated fair value of our fixed rate senior notes, debentures and certain tax-exempt financings is based on quoted market prices. The fair value of our remaining notes payable, tax-exempt financings and borrowings under our credit facilities approximates the carrying value because the interest rates are variable. The fair value estimates were based on Level 2 inputs of the fair value hierarchy as of September 30, 2025 and December 31, 2024. See Note 7, Debt, for further information related to our debt.