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Fair Value Measurements
 12 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
We consider the carrying amounts of current assets and current liabilities to approximate their fair values because of the relatively short period of time between the origination of these instruments and their expected realization or payment. For our financial instruments measured at fair value on a recurring basis, we prioritize the inputs used in measuring fair value according to a three-tier fair value hierarchy as follows:
Level 1 — Observable Inputs. Level 1 financial instruments are actively traded and therefore the fair value for these securities is based on quoted market prices for identical securities in active markets.
Level 2 — Directly or Indirectly Observable Inputs. Fair value for these investments is determined using a market approach based on quoted prices for similar securities in active markets or quoted prices for identical securities in inactive markets.
Level 3 — Unobservable Inputs. Level 3 financial instruments are valued using unobservable inputs that represent management’s best estimate of what market participants would use in pricing the financial instrument at the measurement date.
Our financial instruments measured at fair value on a recurring basis at December 31, 2024, were as follows:
TotalLevel 1Level 2Level 3
 (In millions)
Corporate debt securities$2,744 $— $2,744 $— 
Mortgage-backed securities914 — 914 — 
Asset-backed securities431 — 431 — 
Municipal securities183 — 183 — 
U.S. Treasury notes5 — 5 — 
Other
48 — 48 — 
Total assets$4,325 $— $4,325 $— 
Our financial instruments measured at fair value on a recurring basis at December 31, 2023, were as follows:
TotalLevel 1Level 2Level 3
 (In millions)
Corporate debt securities$2,732 $— $2,732 $— 
Mortgage-backed securities911 — 911 — 
Asset-backed securities365 — 365 — 
Municipal securities166 — 166 — 
U.S. Treasury notes40 — 40 — 
Other
45 — 45 — 
Total assets$4,259 $— $4,259 $— 
Fair Value Measurements – Disclosure Only
The carrying amounts and estimated fair values of our notes payable are classified as Level 2 financial instruments. Fair value for these securities is determined using a market approach based on quoted market prices for similar securities in active markets or quoted prices for identical securities in inactive markets.
 December 31, 2024December 31, 2023
 Carrying
Amount		Fair Value Carrying
Amount		Fair Value
 (In millions)
4.375% Notes due 2028
$795 $759 $794 $757 
3.875% Notes due 2030
645 578 644 583 
3.875% Notes due 2032
743 648 742 654 
6.250% Notes due 2033
740 741 — — 
Total$2,923 $2,726 $2,180 $1,994